If your furnace is dying, you're facing a genuinely different decision than homeowners did ten years ago. Heat pumps have gotten good — good enough to heat homes through Minnesota winters — and rebates can knock thousands off the price. But a gas furnace is still the cheaper, simpler answer for plenty of houses.
The right call comes down to four things: what you pay upfront, what you pay each winter, how the heat feels, and how long the equipment lasts. Here's how the math actually shakes out in 2026.
A straightforward gas furnace replacement — a 96% AFUE unit, installed — runs $5,500 to $9,500 in most US markets. A ducted heat pump sized to heat the whole house runs $12,000 to $18,000, with cold-climate models at $14,000 to $20,000. That gap looks brutal until you remember the heat pump is also your air conditioner, so the fair comparison is furnace plus central AC: $11,000 to $16,000 installed.
Then rebates enter the picture, and the 2026 landscape has shifted. Stack a strong utility rebate on top of the furnace-plus-AC comparison and the heat pump premium can shrink to a rounding error.
A furnace makes heat by burning gas. A heat pump moves heat from outdoor air, delivering two to three-plus units of heat per unit of electricity — which is how it beats 100% efficiency. At 2026 national averages of about 17 cents per kilowatt-hour and $1.55 per therm, delivered heat costs are nearly identical: roughly 5.5 cents per kilowatt-hour of heat from a 96% furnace versus about 5.7 cents from a heat pump averaging a COP of 3.
Your climate zone breaks the tie, because heat pump efficiency drops as temperatures do:
A furnace delivers 120–140°F air in short, powerful bursts — fast recovery, but noticeable temperature swings between cycles. A heat pump delivers 90–105°F air over longer, quieter run times, which keeps rooms more even but can feel lukewarm if you hold your hand over a vent.
Most people who switch stop noticing within a month, and variable-speed heat pumps dehumidify better in summer than the AC they replace. The one real caveat: if a heat pump is undersized, electric backup strips kick in during cold snaps, and those heat your home at roughly triple the cost.
A gas furnace lasts 15 to 20 years. A heat pump lasts 12 to 15, because it works year-round — it's your AC in July and your heat in January. Central air conditioners last about the same 12 to 15.
That reframes the decision. If your furnace died but your AC is five years old, replacing just the furnace is perfectly defensible. If both are pushing 12-plus years, one heat pump replaces two machines, and the math tilts hard in its favor.
A dual-fuel system pairs a heat pump with a gas furnace as backup. The heat pump handles everything above the balance point — typically 25–35°F, which covers the large majority of heating hours even in zone 5 — and the furnace takes over below it. You get heat pump economics most of the winter and furnace muscle for the cold snaps, for roughly $2,000 to $4,000 more than a standard furnace-and-AC swap.
The catch: dual-fuel only pays off if the load calculation, equipment sizing, and switchover temperature are set correctly. That's Manual J territory, plus refrigerant, gas, and electrical work — exactly the part a licensed contractor like Acme HVAC should handle, because bad sizing is the single most common reason heat pumps disappoint.
Get quotes for both options and ask each contractor to show operating-cost estimates using your actual utility rates, not national averages. Then check your utility's rebate page before you sign anything — in some territories it's the rebate, not the equipment, that decides the winner. The short version: