Every factual sentence carries assertions checked against the recorded evidence: references must resolve, figures and quotations must be in the cited passage, arithmetic must reproduce, and an independent reviewer must approve the wording. Automated validation says whether the narration is ready for human editorial review; it does not establish truth.
Open a sentence to see its assertions, their status and the passages behind them. Sentences without a marker make no factual claim.
verified s02.a Atlas AC says the increased cost to convert a gas system to a heat pump "could be offset in savings by year five".
supported (approved): no direct support, 1 contradicting, 2 qualifying, 4 context only, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s03.a In a Skill Builder video, the payback on a heat pump is put at four years: "So, four years you got your money back".
supported (approved): no direct support, 5 contradicting, 2 qualifying, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s04.a The Washington Post's modelling of a gas-heated home with a minimum-efficiency heat pump found "the payback period around 48 years".
supported (approved): no direct support, 3 qualifying, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s08.a An electrification advocacy guide says that, with energy bill savings, "a heat pump will often pay off in about 15 years".
supported (approved): no direct support, 3 qualifying, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
warning speaker-missing: the quotation names no speaker; the reviewer confirms the narration does not say who spoke
verified s09.a Tom Bray, reporting his own heat pump data, says "a simple calculation would suggest around 18 to 25 years" to pay back.
supported (approved): no direct support, 3 qualifying, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s12.a The national model behind the best-case lifetime figure covers a representative set of 550,000 homes.
qualified (qualify): no direct support, 4 qualifying.
warning needs-qualification: Wilson 2024 (NREL and LBNL), heat pumps for all?: Picking the best package per home, 59% (65 million) have positive unsubsidized NPV over 16 years, but no single package exceeds 55%, and that is an idealized best choice. Add the qualification: the evidence supports a narrower or weaker statement.
verified s14.a Even choosing the best upgrade package for each modelled home, only 59% had a positive unsubsidized net present value.
qualified (qualify): no direct support, 4 qualifying.
warning needs-qualification: Wilson 2024 (NREL and LBNL), heat pumps for all?: Picking the best package per home, 59% (65 million) have positive unsubsidized NPV over 16 years, but no single package exceeds 55%, and that is an idealized best choice. Add the qualification: the evidence supports a narrower or weaker statement.
verified s14.b Wilson's consumer economics compare heat pump installation with a reference scenario of like-for-like replacement of equipment at end of lifetime.
supported (qualify): 1 supporting (1 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s15.a The minimum-efficiency heat pump had the largest share of homes with positive unsubsidized NPV, 55%; higher upfront costs cut the share to 41% and 21% for the medium- and high-efficiency cold-climate units.
qualified (qualify): 1 supporting (1 independent, strongest 0.55), 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s17.a Deetjen finds 16.7 million houses, 21% of the US single-family residential stock, could benefit economically from replacing their heater with a heat pump.
qualified (qualify): 1 supporting (1 independent, strongest 0.5), 3 qualifying, 1 context only.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s17.b Deetjen counts only the extra cost of a heat pump over replacing the existing heater with a similar technology, assuming purchase when the existing heater is nearing the end of its life.
supported (qualify): 1 supporting (1 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s62.a Both national models price the heat pump as bought at the end of the old equipment's life, counting only the extra cost over a like-for-like replacement.
supported (qualify): 2 supporting (2 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s19.a Edwards' Monte Carlo bill model finds 53% of households with reduced energy bills, 19% with higher costs and 28% with no clear benefit or cost.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s20.a The highest share of homes with positive lifetime value in the national model is 59%, with the best package chosen for each home.
qualified (qualify): no direct support, 4 qualifying.
warning needs-qualification: Wilson 2024 (NREL and LBNL), heat pumps for all?: Picking the best package per home, 59% (65 million) have positive unsubsidized NPV over 16 years, but no single package exceeds 55%, and that is an idealized best choice. Add the qualification: the evidence supports a narrower or weaker statement.
verified s21.a With positive unsubsidized NPV over the equipment life for at most 55% of homes per heat pump option, a few-year payback is not the typical outcome.
qualified (qualify): 1 supporting (1 independent, strongest 0.55), 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s23.a Primary heating fuel is one of the two housing characteristics with the largest impact on heat pump bill savings in the national model.
qualified (qualify): 1 supporting (1 independent, strongest 0.6), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Bernard 2024 (NBER), UK heat pumps and a time-of-use tariff: UK households that previously used electric heating saw electricity use fall after a heat pump, wh…
verified s24.a For homes heating with electricity, fuel oil or propane that have AC, 95% to 100% have positive bill savings, with median savings of $300 to $650 per year.
qualified (qualify): 1 supporting (1 independent, strongest 0.6), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Bernard 2024 (NBER), UK heat pumps and a time-of-use tariff: UK households that previously used electric heating saw electricity use fall after a heat pump, wh…
verified s25.a For 46 million gas-heated homes with AC, the share with positive bill savings ranges from 38% to 99% depending on heat pump performance.
qualified (qualify): 1 supporting (1 independent, strongest 0.6), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Bernard 2024 (NBER), UK heat pumps and a time-of-use tariff: UK households that previously used electric heating saw electricity use fall after a heat pump, wh…
verified s26.a Deetjen finds switching a home's heating from natural gas to a heat pump "rarely produces a benefit", especially in cold climates.
supported (approved): 1 supporting (1 independent, strongest 0.65).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s29.a In Wilson's model the minimum-efficiency heat pump has positive unsubsidized NPV for a group that includes most homes that use fuel oil for heating.
qualified (qualify): 1 supporting (1 independent, strongest 0.55), 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s29.b Deetjen finds heat pump adoption in fuel-oil-heated homes "usually causes the homeowner a private economic loss"; nearly 65% of fuel-oil-heated houses are in cold climates.
qualified (qualify): no direct support, 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. "causes" is stronger than the evidence (strongest support 0). Add the qualification: the evidence supports a narrower or weaker statement.
verified s30.a Cadmus found ductless heat pumps "always operate less expensively than propane heating systems", and cheaper to run than oil except in very cold conditions.
qualified (qualify): 1 supporting (1 independent, strongest 0.45), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Bernard 2024 (NBER), UK heat pumps and a time-of-use tariff: UK households that previously used electric heating saw electricity use fall after a heat pump, wh…
verified s31.a Both national models price the heat pump against replacing the old equipment like for like at the end of its life.
supported (qualify): 2 supporting (2 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s32.a Using the NREL cost database, the Minnesota study puts the average cold-climate heat pump with propane furnace backup at $9,450 installed.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s33.a With no equipment failure, simple payback is 14.5 years against an 82% furnace and 28.8 years against a condensing furnace; the study assumes an 18-year life expectancy.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s34.a When both the furnace and AC have failed, the incremental cost is $370 and simple payback is 1.1 years against a condensing furnace and 0.6 years against an 82% furnace.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s36.a The Minnesota payback range comes from the incremental cost over the equipment that would otherwise be replaced, with the same $9,450 installed cost in each scenario.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s37.a CEE reports that for retrofits paybacks will typically be "longer than 10 years, unless equipment replacement is necessary", and drop to 5-6 years at either heating or cooling system failure.
qualified (qualify): no direct support, 3 qualifying.
warning needs-qualification: CEE 2018, ducted and ductless cold-climate heat pumps in the field: Payback is 5-6 years only when the existing heating or cooling system has failed; as a pure retrofit it typically exceeds 10 years, so 'a few years' holds only at replacement time. Add the qualification: the evidence supports a narrower or weaker statement.
verified s39.a RMI finds electrification cost-effective for gas customers who "would otherwise need to replace both a furnace and air conditioner simultaneously".
supported (approved): 1 supporting (1 independent, strongest 0.5).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s40.a For existing gas homes electrifying space and water heating, RMI finds they either pay more for energy (Chicago, Providence) or save too little to make up the extra capital cost (Houston, Oakland).
qualified (qualify): no direct support, 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. Add the qualification: the evidence supports a narrower or weaker statement.
verified s42.a Homes leaving propane or electric resistance heat are the clearest winners from a heat pump.
qualified (qualify): 1 supporting (1 independent, strongest 0.6), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Add the qualification: the evidence supports a narrower or weaker statement.
info numbers (review): 'From decades' is loose for the no-failure paybacks in CEE's Table 11 (28.8 years against a condensing furnace but 14.5 against an 82% furnace); the exact figures are given in s33 ten sentences earlier, so the summary does not mislead, and 'about a year' fairly renders 0.6-1.1.
verified s43.a Both national models price the heat pump against like-for-like replacement at the end of the old equipment's life.
supported (qualify): 2 supporting (2 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s43.b In the Minnesota cost data, simple payback falls from 14.5-28.8 years with no failure to 0.6-1.1 years when both the furnace and AC have failed.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s44.a Switching from natural gas rarely produces a private benefit in Deetjen's model.
supported (approved): 1 supporting (1 independent, strongest 0.65).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s46.a Consumer Reports advises, for poorly insulated, leaky or older homes, first upgrading insulation and sealing air leaks.
supported (approved): no direct support, 1 qualifying, 1 source statement.
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s47.a For the example segment, envelope upgrades reduce the mean rated capacity of the medium- and high-efficiency heat pumps and their mean installation costs by $4,000 and $2,500.
qualified (qualify): no direct support, 1 qualifying.
warning needs-qualification: Wilson 2024 (NREL and LBNL), heat pumps for all?: ResStock modelling: envelope upgrades cut bill-increase cases (39% to 19% with minimum-efficiency units) and shrink heat pump capacity, but add about $9,000 so the net upfront cost rises, raising positive-NPV share slightly in cold climates and lowering it in warmer ones. Add the qualification: the evidence supports a narrower or weaker statement.
warning omission (review): The unsupported cold/warm clause is gone and the sentence is accurate. But in a section on 'things that move these numbers' the viewer hears only that insulating raised upfront cost. The same study finds envelope upgrades cut the share of homes with higher bills from 39% to 19% with minimum-efficiency units (L362-L363) and slightly raise the positive-NPV share in cold climates while lowering it in warmer ones (L526-L529). Neither passage is in the package; without them the section reads as 'insulation makes the numbers worse'.
verified s48.a In the example segment the envelope upgrades add a mean $9,000 per dwelling, so the net effect is an overall increase in upfront costs.
qualified (qualify): no direct support, 1 qualifying.
warning needs-qualification: Wilson 2024 (NREL and LBNL), heat pumps for all?: ResStock modelling: envelope upgrades cut bill-increase cases (39% to 19% with minimum-efficiency units) and shrink heat pump capacity, but add about $9,000 so the net upfront cost rises, raising positive-NPV share slightly in cold climates and lowering it in warmer ones. Add the qualification: the evidence supports a narrower or weaker statement.
verified s63.a Bills rise in 39% of homes with the minimum-efficiency heat pump, and in 19% if combined with envelope upgrades.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s63.b In the cold and very-cold climate zones the envelope upgrade scenarios slightly increase the share of homes with positive unsubsidized NPV, whereas they generally decrease it in warmer climates.
qualified (qualify): 1 supporting (1 independent, strongest 0.45), 2 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: RMI says electric space heating is less suitable in inefficient buildings, especially in cold climates, yet its leaky retrofit homes in mild Houston and Oakland still had lower heat pump energy costs. Less 2021 (LBNL), cost of decarbonization retrofits: LBNL: the cheapest high-savings approach paired heat pumps with only typical weatherization (at…
verified s49.a Bill savings vary more between the 5th and 95th percentile homes within one location than geographically.
supported (approved): 1 supporting (1 independent, strongest 0.7).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s50.a Bill savings vary geographically with climate, energy prices and housing stock.
supported (approved): 1 supporting (1 independent, strongest 0.7).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s53.a Homes heating with propane or electric resistance see the largest savings from heat pumps.
qualified (qualify): 1 supporting (1 independent, strongest 0.6), 2 qualifying.
warning needs-qualification: Deetjen 2021, private economics of US residential heat pumps: Counting capital cost, resistance and propane homes usually gain, but oil-heated homes usually take a private loss (65% are in cold climates), so oil is not among the best cases. Add the qualification: the evidence supports a narrower or weaker statement.
verified s54.a Heat pump payback is shortest at the time the existing furnace or AC fails, when the incremental cost is smallest.
supported (approved): 1 supporting (1 independent, strongest 0.55).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s55.a Both national models price the heat pump against like-for-like replacement at end of life, not early replacement of working equipment.
supported (qualify): 2 supporting (2 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s55.b Switching a home's heating from natural gas to a heat pump "rarely produces a benefit" in Deetjen's model.
supported (approved): 1 supporting (1 independent, strongest 0.65).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s55.c In Wilson's model the minimum-efficiency heat pump has positive unsubsidized NPV for a group that also includes most homes that use natural gas and have central AC in warmer climates.
qualified (qualify): 1 supporting (1 independent, strongest 0.55), 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s64.a RMI finds electrification cost-effective for gas customers who would otherwise need to replace both a furnace and air conditioner simultaneously, and for customers who bundle rooftop solar with electrification.
supported (approved): 1 supporting (1 independent, strongest 0.5).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
verified s58.a Deetjen finds 21% of US single-family houses could benefit economically, counting only the extra cost over replacing the existing heater at the end of its life.
qualified (qualify): 1 supporting (1 independent, strongest 0.5), 3 qualifying, 1 context only.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s58.b In the national lab model, the best single heat pump option has positive unsubsidized NPV for 55% of homes, against like-for-like replacement at end of lifetime.
qualified (qualify): 1 supporting (1 independent, strongest 0.55), 3 qualifying.
warning needs-qualification: RMI 2018, the economics of electrifying buildings: In RMI's gas retrofits, heat pumps either raise energy costs (Chicago, Providence) or save too little to recover the extra capital (Houston, Oakland), so for most gas homes they never pay back at 2018 prices. [partial: gas retrofits in four modelled cities either cost more to run or save too little to recover the capital; four cities and 2018 pric…
verified s58.c Both models price the heat pump against replacement of the old equipment at the end of its life.
supported (qualify): 2 supporting (2 independent, strongest 0.4).
warning needs-qualification: The strongest support is weak (0.4); say "one study suggests" or find stronger evidence.
verified s59.a Heat pump economics depend on baseline heating fuel, climate and prices, and the equipment being replaced.
supported (approved): 2 supporting (2 independent, strongest 0.65).
info wording: Wording differs from the canonical claim; the reviewer confirms the passages entail it.
34 scenes, 10:17 at 150 words per minute including pauses. Narration is copied from the script; every chart value and on-screen citation is checked against a passage.
1. sc01 · 0:00 to 0:07 typography
A common pitch for a heat pump ends the same way: it pays for itself.
Visual. Near-black field. The words 'it pays for itself' type on in large off-white serif, centred, then hold. A thin amber underline draws under 'pays'. Nothing else on screen.
On screen. it pays for itself
2. sc02 · 0:07 to 0:17 typography
One HVAC company, Atlas AC, tells its viewers that the extra cost of converting a gas system "could be offset in savings by year five".
Visual. Quote card: the quoted words in amber serif, the channel name small beneath in grey. The phrase 'by year five' brightens as it is spoken.
On screen. "could be offset in savings by year five"
Cite. Atlas AC, Heat Pump vs. Furnace video
3. sc03 · 0:17 to 0:25 typography
In a Skill Builder video about a British home, the verdict is even quicker: "So, four years you got your money back".
Visual. Second quote card replaces the first with a horizontal push; same layout; 'four years' brightens.
On screen. "So, four years you got your money back"
Cite. Skill Builder, heat pump video
4. sc04 · 0:25 to 0:37 typography
Then the Washington Post ran the numbers for one gas-heated house with a basic heat pump, and got a very different answer, "making the payback period around 48 years".
Visual. Third quote card, slate-blue accent instead of amber to mark it as a calculation rather than a pitch; '48 years' set larger than the rest.
On screen. "making the payback period around 48 years"
Cite. Washington Post, home upgrade calculation
5. sc05 · 0:37 to 0:48 typography
That is not a rounding error. So which homes get their money back from a heat pump, how fast, and which ones never do?
Visual. The three quote cards shrink into a row of small blank cards, then fade; the question types on alone.
On screen. Which homes get their money back?
6. sc06 · 0:48 to 1:04 typography
Pitches like these describe payback as if it were a property of the machine. Even an electrification group that promotes heat pumps is more careful, telling readers that "a heat pump will often pay off in about 15 years".
Visual. Quote card in a neutral grey accent (not amber, not slate): the advocacy guide's words; no organisation name on screen because the narration names none.
On screen. "a heat pump will often pay off in about 15 years"
Cite. Electrification advocacy guide
7. sc07 · 1:04 to 1:19 typography
And one British owner who publishes detailed running data, Tom Bray, concluded that "a simple calculation would suggest around 18 to 25 years". Every one of those numbers could be right for the house it describes.
Visual. Quote card with the owner's name; on s10 all four payback quotes from the opening reappear small around the edge, each attached to a simple house outline, to say each number belongs to one house.
On screen. "a simple calculation would suggest around 18 to 25 years"
Cite. Tom Bray, three years of heat pump data
8. sc08 · 1:19 to 1:32 diagram
The question is what happens across millions of houses, so that is where we will look: at national models that run the numbers home by home, and at meters in real homes.
Visual. Two icons side by side: a grid of many small houses labelled 'national models' and a single house with a meter labelled 'field measurements'. The grid fills in as the narration says 'home by home'.
On screen. national models / field measurements
9. sc09 · 1:32 to 1:39 diagram
Start with a national laboratory model that simulated about 550,000 representative American homes.
Visual. The grid of small houses zooms out until it reads as texture; a label sets its scale. No map, no states.
On screen. about 550,000 representative homes
10. sc10 · 1:39 to 2:15 data-chart
Over the life of the equipment and without any subsidy, compared with replacing the old equipment like for like when it wears out, 59 percent came out ahead if every home picked its single best option. But no real buyer gets to pick with perfect hindsight, and no single heat pump did that well: the cheapest, minimum-efficiency units came out ahead in 55 percent of homes, and the premium cold-climate units in only 21 percent, because their higher price ate the extra savings.
Visual. Horizontal bars, slate blue. First a single bar for 'best option for each home'; on s15 three more bars draw under it for the three heat pump tiers, the premium bar visibly shortest. A small caption under the chart states the comparison: against like-for-like replacement at end of life.
On screen. compared with replacing like for like at end of life
| Best option picked for each home | 59% | 59 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 645-L647 |
| Minimum-efficiency heat pump | 55% | 55 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 497-L520 |
| Medium-efficiency heat pump | 41% | 41 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 497-L520 |
| High-efficiency cold-climate heat pump | 21% | 21 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 497-L520 |
Cite. Wilson et al., NREL and LBNL national model (Joule)Wilson et al., NREL and LBNL national model (Joule)
11. sc11 · 2:15 to 2:39 data-chart
A second national model of single-family houses was harsher still. It found a heat pump would pay off for about 16.7 million houses, 21 percent of all single-family homes, at the energy prices it assumed, again counting only the extra cost over replacing the old heater with a similar one when it nears the end of its life.
Visual. A single large stat tile: '21%' with 'of all single-family houses' beneath; a smaller line names the count. A thin caption states the baseline: extra cost over replacing the old heater with a similar one.
On screen. 16.7 million houses / extra cost over a similar replacement
| Share of US single-family houses | 21% | 21 | percent | Deetjen 2021, private economics of US residential heat pumps, lines 570-L574 |
Cite. Deetjen et al., US residential heat pump modelDeetjen et al., US residential heat pump model
12. sc12 · 2:39 to 2:50 document-excerpt
So both figures are already the good-timing case: the heat pump bought at the moment the old equipment would have had to be replaced anyway.
Visual. The national lab paper's discussion paragraph appears as a clean text render; the phrase about like-for-like replacement at end of lifetime is highlighted in slate blue. A second, smaller card underneath shows the other model's equation sentence about the cost of replacing the existing heater with a similar technology.
On screen. the good-timing case
Cite. Wilson et al., NREL and LBNL national model (Joule)Deetjen et al., US residential heat pump model
13. sc13 · 2:50 to 3:06 data-chart
So is it a majority, or a minority? A third team, mapping energy bills county by county, found 53 percent of households would see lower bills, 19 percent higher ones, and 28 percent no clear change either way.
Visual. One horizontal stacked bar across the screen: lower bills (slate), no clear change (grey), higher bills (red). Segments draw in the order spoken. A small caption: 'bills only, not lifetime value'.
On screen. bills only
| Lower bills | 53% | 53 | percent | Edwards 2024, inequities in heat pump bill savings, lines 292-L299 |
| Higher bills | 19% | 19 | percent | Edwards 2024, inequities in heat pump bill savings, lines 292-L299 |
| No clear change | 28% | 28 | percent | Edwards 2024, inequities in heat pump bill savings, lines 292-L299 |
14. sc14 · 3:06 to 3:28 typography
Even the most generous lifetime figure here, the 59 percent, is a thin majority, and it assumes every home picks its best option. If only a slim majority of homes come out ahead over the whole life of the equipment, a payback of a few years cannot be the typical case.
Visual. The 59% bar from earlier returns alone, small; beside it the line 'a thin majority'. Then the earlier phrase 'pays for itself in a few years' appears and is struck through in grey.
On screen. 59% / a thin majority / a few years: not the typical case
Cite. Wilson et al., NREL and LBNL national model (Joule)Wilson et al., NREL and LBNL national model (Joule)
15. sc15 · 3:28 to 3:40 diagram
Which raises the more useful question: who is in the winning group? The national lab model names one of the biggest factors, and it is what you heat with today.
Visual. Four fuel icons in a row: electric resistance, fuel oil, propane, natural gas. They appear as the narration reaches 'what you heat with today'.
On screen. what you heat with today
16. sc16 · 3:40 to 4:06 data-chart
For homes that now heat with electricity, fuel oil or propane and already have air conditioning, the national lab model found that almost all would see lower bills, with median savings of $300 to $650 a year. For gas-heated homes with air conditioning, it depended on the equipment: anywhere from 38 to 99 percent saved on their bills.
Visual. Two-row table under the fuel icons. Row one, electric/oil/propane homes with AC: share with lower bills and median annual saving. Row two, gas homes with AC: the share range from the cheapest to the best equipment, drawn as a low and a high marker on one line.
| Electric, oil or propane: share with lower bills | 95%–100% | 95 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 393-L414 |
| Electric, oil or propane: median saving per year | $300–$650 | 300 | usd | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 393-L414 |
| Natural gas, minimum-efficiency unit | 38% | 38 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 393-L414 |
| Natural gas, best unit | 99% | 99 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 393-L414 |
17. sc17 · 4:06 to 4:14 document-excerpt
The second model put it more bluntly: switching from natural gas "rarely produces a benefit", especially in cold climates.
Visual. Text render of the second model's paragraph on heating fuel; 'rarely produces a benefit' highlighted.
18. sc18 · 4:14 to 4:39 diagram
On oil, the models disagree. The national lab model, counting the cost of the equipment, found a basic heat pump came out ahead over its life for most homes heated with fuel oil; the second model found a switch from oil "usually causes the homeowner a private economic loss", in part because nearly 65 percent of oil-heated houses are in cold climates.
Visual. Split screen with the oil icon at the top. Left half (slate): 'national lab model: most oil-heated homes came out ahead with a basic unit'. Right half (slate, same weight): 'second model: usually a private economic loss'. A small caption on the right: 'nearly 65% of oil-heated houses are in cold climates'. Neither side is marked right.
On screen. most oil-heated homes came out ahead / "usually causes the homeowner a private economic loss" / nearly 65% of oil-heated houses are in cold climates
Cite. Wilson et al., NREL and LBNL national model (Joule)Deetjen et al., US residential heat pump model
19. sc19 · 4:39 to 4:51 typography
Meters in New England homes found ductless heat pumps "always operate less expensively than propane heating systems", and cheaper to run than oil too, except on very cold days.
Visual. A single house with a meter icon; under it the quoted line about propane; a second line for oil with 'except on very cold days' in grey.
On screen. "always operate less expensively than propane heating systems" / cheaper than oil, except on very cold days
20. sc20 · 4:51 to 5:01 diagram
Both of those national figures are already the good-timing case; the field data show what it costs to switch before the old equipment is due.
Visual. A horizontal timeline for one house's old equipment: a marker at 'end of life'. A slate dot sits on the marker labelled 'national figures'. A second dot appears earlier on the line labelled 'switching early'.
On screen. national figures: at end of life / switching early
Cite. Wilson et al., NREL and LBNL national model (Joule)Deetjen et al., US residential heat pump model
21. sc21 · 5:01 to 5:42 data-chart
A Minnesota study priced a cold-climate heat pump with a propane furnace as backup at $9,450 installed, using a national cost database. Installed while the old furnace and air conditioner still worked, its simple payback came to 14.5 years against an older furnace and 28.8 years against an efficient condensing one, longer than the 18 years the study expects the equipment to last. Installed when both had failed and needed replacing anyway, the extra cost fell to just $370, and the payback to between 0.6 and 1.1 years.
Visual. Vertical bars of the extra cost over what would be bought anyway, one per situation, from 'nothing failed' (tallest) to 'furnace and AC both failed' (tiny). Payback ranges appear as labels above the first and last bars as they are spoken. Caption: Minnesota example, propane furnace backup, national cost database.
On screen. payback 14.5 to 28.8 years / payback 0.6 to 1.1 years / expected life: 18 years
| Nothing failed | $9,450 | 9450 | usd | CEE 2017, cold-climate heat pumps in Minnesota, lines 1376-L1408 |
| Air conditioner failed | $4,270 | 4270 | usd | CEE 2017, cold-climate heat pumps in Minnesota, lines 1376-L1408 |
| Furnace failed | $5,550 | 5550 | usd | CEE 2017, cold-climate heat pumps in Minnesota, lines 1376-L1408 |
| Furnace and air conditioner failed | $370 | 370 | usd | CEE 2017, cold-climate heat pumps in Minnesota, lines 1376-L1408 |
Cite. Center for Energy and Environment, Minnesota cold-climate study
22. sc22 · 5:42 to 5:50 typography
Same house, same machine, same bills. The only thing that changed was what you would have had to buy anyway.
Visual. Three short lines stack: 'same house', 'same machine', 'same bills'. Then a fourth line in amber: 'what you would have bought anyway'.
On screen. same house / same machine / same bills / what you would have bought anyway
23. sc23 · 5:50 to 6:08 document-excerpt
The project's later report, from the same Minnesota research, put it plainly: for retrofits, paybacks will typically run "longer than 10 years, unless equipment replacement is necessary", and drop to 5 to 6 years when either the heating or the cooling system has failed.
Visual. Text render of the later report's conclusion with 'longer than 10 years, unless equipment replacement is necessary' highlighted; a small tag reads 'same Minnesota research'.
On screen. same Minnesota research
Cite. Center for Energy and Environment, Minnesota cold-climate study (later report)
24. sc24 · 6:08 to 6:39 diagram
A model of gas-heated homes in Chicago, Providence, Houston and Oakland, at the energy prices it used, found the same pattern. Switching paid off for gas customers who "would otherwise need to replace both a furnace and air conditioner simultaneously". Otherwise, existing gas homes that switched both heating and water heating to electric either paid more for energy, in colder Chicago and Providence, or saved too little to make up the extra cost, in Houston and Oakland.
Visual. Three labelled lines build as spoken: when switching paid off, then the two colder cities and the two milder ones. City names only, no maps.
On screen. paid off: furnace and AC replaced together / Chicago and Providence: paid more for energy / Houston and Oakland: saved too little
25. sc25 · 6:39 to 7:15 typography
Put the pieces together and a pattern appears. If you are leaving propane or electric resistance heat, a heat pump usually pays. Buying when the old equipment is due for replacement is the case the national figures already describe; in the Minnesota example, with a propane furnace as backup, replacing a failed furnace and air conditioner together cut the payback from decades to about a year. And if you are tearing out a working gas furnace, the models mostly say it will not pay back on energy savings alone.
Visual. Three lines build one per sentence: 'leaving propane or electric resistance: usually pays'; 'buying at replacement time: the case the national figures describe; Minnesota example: about a year'; 'tearing out a working gas furnace: mostly does not pay'.
On screen. leaving propane or resistance heat: usually pays / buying at replacement time: the case the national figures describe / Minnesota example: about a year / tearing out a working gas furnace: mostly does not pay
Cite. Wilson et al., NREL and LBNL national model (Joule)Deetjen et al., US residential heat pump modelCenter for Energy and Environment, Minnesota cold-climate studyDeetjen et al., US residential heat pump model
26. sc26 · 7:15 to 7:29 typography
There are things that move these numbers. The first is insulation: for older or leaky homes, Consumer Reports says "it’s always a good idea to first upgrade your insulation and seal any air leaks".
Visual. Quote card, neutral accent, Consumer Reports named; above it a small tag 'older or leaky homes'.
On screen. “it’s always a good idea to first upgrade your insulation and seal any air leaks”
Cite. Consumer Reports, heat pump buying guide
27. sc27 · 7:29 to 7:52 data-chart
In one group of homes the national lab model examined, sealing and insulating let the medium- and high-efficiency heat pumps be smaller, cutting their installed cost by $2,500 to $4,000. But the insulation work itself added about $9,000 in that group, so the total upfront cost went up.
Visual. Stat tiles: two green tiles for the installed-cost reduction (medium and high-efficiency units), then a red tile for the insulation work added. Caption: one group of homes in the model.
| Smaller medium-efficiency heat pump: lower installed cost | $4,000 | 4000 | usd | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 465-L479 |
| Smaller high-efficiency heat pump: lower installed cost | $2,500 | 2500 | usd | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 465-L479 |
| Insulation and air sealing added | $9,000 | about 9000 | usd | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 465-L479 |
28. sc28 · 7:52 to 8:08 data-chart
It did cut the share of homes whose bills went up with the cheapest units, from 39 percent to 19 percent, and it nudged the lifetime numbers up slightly in cold climates while lowering them in warmer ones.
Visual. Two bars: homes whose bills went up with the cheapest units, without and with insulation. Below, a small two-cell line: 'cold climates: slightly better lifetime value' and 'warmer climates: slightly worse'.
On screen. cold climates: slightly up / warmer climates: down
| Without envelope upgrades | 39% | 39 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 362-L366 |
| With envelope upgrades | 19% | 19 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 362-L366 |
Cite. Wilson et al., NREL and LBNL national model (Joule)Wilson et al., NREL and LBNL national model (Joule)
29. sc29 · 8:08 to 8:27 diagram
The second is your own house: the model found the spread between homes in the same place was bigger than the spread between places. And the savings the model finds depend on local climate and energy prices, so an average is not a forecast for your house.
Visual. Illustrative only, no data: three clusters of dots, one per place; within each cluster the dots spread widely, and the clusters overlap. A caption says 'illustration, not data'.
On screen. more spread within a place than between places / illustration, not data
30. sc30 · 8:27 to 8:51 typography
So what should you do with this? If you heat with propane or electric baseboards, you are in the group where the models here found the biggest savings, so getting quotes is worth your time. If your furnace or air conditioner is near the end of its life, that is the moment the extra cost of a heat pump shrinks the most.
Visual. A short checklist builds: 'propane or electric baseboards: get quotes'; 'furnace or AC near end of life: the extra cost is smallest'.
On screen. propane or electric baseboards: get quotes / furnace or AC near end of life: the extra cost is smallest
Cite. Wilson et al., NREL and LBNL national model (Joule)Center for Energy and Environment, Minnesota cold-climate study
31. sc31 · 8:51 to 9:26 typography
And if both are working fine and you heat with gas, switching early is a worse case than anything these models priced; even at replacement time, the second model found gas homes rarely came out ahead, while the national lab model found most gas homes with central air in warmer climates did. In the model of Chicago, Providence, Houston and Oakland, switching paid off for gas homes that needed a new furnace and air conditioner at the same time, or that paired it with rooftop solar.
Visual. Checklist continues with a gas line, split in two: 'second model: rarely came out ahead' and 'national lab model: most gas homes with central air in warmer climates did'. Then a small line: 'four-city model: paid off with furnace and AC replaced together, or with rooftop solar'.
On screen. working gas system: switching early is the worst case / second model: rarely came out ahead / national lab model: most warm-climate gas homes with central air did / paid off with furnace and AC replaced together, or with rooftop solar
Cite. Deetjen et al., US residential heat pump modelWilson et al., NREL and LBNL national model (Joule)RMI, economics of electrifying buildings
32. sc32 · 9:26 to 9:35 typography
Whatever a seller promises, ask one question: payback compared with what, a new furnace and air conditioner, or nothing at all?
Visual. The question alone, large: 'payback compared with what?'
On screen. payback compared with what?
33. sc33 · 9:35 to 9:56 data-chart
So, does a heat pump pay for itself? For some homes, quickly; for many, never: even when bought at replacement time, one national model found a lifetime gain for 21 percent of all single-family houses, the other for at most 55 percent of homes with any single heat pump.
Visual. Two bars side by side with their denominators written under each: 'of all single-family houses' and 'of homes, best single heat pump'. Caption: even when bought at replacement time.
On screen. even when bought at replacement time
| Second model: all single-family houses | 21% | 21 | percent | Deetjen 2021, private economics of US residential heat pumps, lines 570-L574 |
| National lab model: best single heat pump | 55% | lte 55 | percent | Wilson 2024 (NREL and LBNL), heat pumps for all?, lines 497-L520 |
Cite. Deetjen et al., US residential heat pump modelWilson et al., NREL and LBNL national model (Joule)
34. sc34 · 9:56 to 10:17 typography
Which group you are in depends on the fuel you are leaving, the prices where you live, and whether you buy when your old equipment needs replacing anyway. A quick payback is possible. It just is not a promise anyone can make about your house before looking at it.
Visual. Three words appear: 'fuel', 'prices', 'timing'. Then 'it pays for itself' from the opening returns, with 'sometimes' added in slate before it. Fade to black.
On screen. fuel / prices / timing / sometimes it pays for itself
Cite. Deetjen et al., US residential heat pump modelCenter for Energy and Environment, Minnesota cold-climate study