The Front Range heats for real. Design nights near zero, a season that runs from October past April, and a housing stock that spans 1900s bungalows to boom-decade two-stories built by the subdivision. Most of that stock heats on natural gas, which makes Denver's version of this comparison honest and close in a way mild markets never see, and it makes the exceptions, the foothills propane households, the strip-heat conversions, the rare oil tank, the places where the arithmetic stops being close at all. This guide runs the conversion math against every legacy fuel the metro actually uses, with the 2026 incentive stack, the deepest in the country, waiting at the end to move verdicts that were already leaning.
The Ledger in One Table
| Existing heat | Case for a heat pump | Strength |
|---|---|---|
| Electric strip heat or baseboard | Same meter, a half to a third the consumption | Strongest |
| Propane (foothills, past the mains) | Truck-priced fuel loses to metered kilowatt hours | Strongest |
| Heating oil | Same truck-versus-meter math, rare in Colorado | Strong, rare |
| Aging AC plus old furnace | One machine upgrades both seasons | Strong |
| Natural gas | Closest race; the stack and the summer settle it | Honest maybe |
Strip Heat: The Multiplication That Never Misses
Electric resistance converts one unit of electricity into one unit of warmth, at full price, every hour of a long Front Range winter. A cold-climate heat pump on the same meter moves two to three units of warmth per unit purchased across most of the season, so the heating share of the bill shrinks toward a half or a third with no fuel forecast in the calculation. In the metro's older apartments, condo conversions, and the baseboard-heated units scattered from Capitol Hill to Englewood, resistance heat still carries whole winters, and because the winter here is long, the absolute dollars are the largest of any case on this page. The conversion also delivers the cooling those units never had, which the summers increasingly demand.
Propane in the Foothills: The Truck Loses to the Meter
West of the metro grid, the carve climbs into propane country: Evergreen, Conifer, Morrison, the Ken Caryl backcountry, and the edges of Jefferson and Douglas counties past the gas mains. Those households buy winter in tank fills at prices that swing with a market they cannot negotiate with, through a season that gives the tank no rest. A cold-climate heat pump replaces those gallons with kilowatt hours that move two to three units of heat apiece, billed monthly at rates that move slowly, and the annual saving lands in four figures for most conversions. The specification tightens at elevation, published low-temperature capacity checked against a real load calculation, per our cold-weather guide, and the arithmetic clears with the widest margin of any fuel here. The rare oil-heated holdout reads the same truck-versus-meter math with the same verdict.
The Two-Machine Problem
A large share of the metro's stock runs a gas furnace and a separate air conditioner, both aging on the schedule they were installed on, from Thornton and Arvada tract homes to Centennial two-stories. When either machine fails, the replacement dollar faces a fork: buy another single-purpose box, or buy one cold-climate heat pump that does both jobs better. The summer side matters more every year, and an old AC loses to a modern variable-speed machine through every cooling month; the winter side rides along upgraded. The fork is where most Front Range heat pumps actually arrive, per our installation cost guide, because the marginal cost of choosing the heat pump at failure time is small and the stack shrinks it further.
The Honest Gas Paragraph
A household with a mid-life furnace on the gas mains faces the closest race in this guide, and deserves it stated coldly. Gas is cheap heat, Front Range winters are long, and displacing a functioning furnace rarely pays on fuel savings alone. What moves the 2026 verdict is everything around the fuel line: Xcel pays $2,250 per heating ton for cold-climate systems and the state adds up to $4,000, per our rebates guide, which can cover a third to half of a conversion; the summers keep asking more of the cooling side; and dual fuel exists precisely for this house, a heat pump carrying the season over a retained furnace backstopping the deepest nights. What no honest bidder does is promise dramatic heating savings against working gas; a bid that does has failed the first test in our contractor guide.
What Altitude Does to the Math
A mile of elevation thins the air, and every machine on this page breathes it. Furnaces derate at altitude; so do heat pumps; the comparison survives because both sides shrink together, but the specification does not survive copying sea-level ratings. The competent Front Range bid derates capacity for elevation and sizes from a load calculation run on the actual house, and the chinook swings that can move a winter day tens of degrees argue for modulating equipment that ramps rather than lurches. The fuel math in this guide assumes the machine was sized by someone who has done this at 5,280 feet.
Reading the First Year Correctly
Judge a conversion by shape, not by a single statement. The propane convert in Evergreen sees a larger winter electric bill and a much smaller year, because the truck line vanished. The strip-heat convert sees the same warmth cheaper immediately. The two-machine replacer sees the summer improve and the winter hold. The discipline that makes all three legible is one ledger: last year's total heating and cooling spend, every fuel, next to this year's, read whole year against whole year. A single January bill is the wrong number in a climate where the season is six months long and the savings are spread across all of them.
The Stack, Which Moves Real Verdicts
Most markets' incentives are a trim on a decision already made. The Front Range stack is large enough to move the decision itself: $2,250 per heating ton from Xcel on cold-climate equipment, roughly $6,000 to $9,000 on typical systems, over up to $4,000 from the state. Against the gas race, that is the thumb on the scale that turns an honest maybe into a yes at replacement time. The federal credits ended December 31, 2025 and belong in no 2026 calculation; the Colorado stack does the work alone, and does it better than the federal line ever did here.
Renters, Landlords, and the Split Incentive
The metro's worst heating economics disproportionately serve people who cannot fix them: baseboard-heated rentals and window-unit summers billed to tenants from Federal Heights to Sheridan. The tenant pays the bill; the owner owns the fix; and the arithmetic reads identically for both, with only the beneficiary line changing. The owner's case needs no charity: the strip-heat conversion is the strongest math on this page, the stack subsidizes it heavily, and the property rents better with real heat and real cooling. A tenant's cheapest move is forwarding this page to whoever holds the deed.
The Short Version
Strip heat loses on a single bill's multiplication, hardest here because the winter is long. Propane loses on truck-versus-meter arithmetic, widest in the foothills. The rare oil tank loses the same way. The two-machine household wins at failure time, when one cold-climate heat pump replaces both boxes. Functioning gas is the honest race, and the 2026 stack plus the growing summers settle it more often than not. The math carries every case from Five Points to Evergreen, sized at altitude, for the design night.
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