Is a heat pump just an air conditioner that also heats?
Yes, that is the honest one-sentence answer. A heat pump is mechanically an air conditioner with a reversing valve added. Both pull heat out of your house in summer and dump it outside. The heat pump simply flips a valve in winter to do the reverse, pulling heat from the outdoor air and moving it inside. That is why a heat pump and AC of the same size cool a room identically, with the same comfort and the same SEER2 efficiency ratings.
Because the hardware overlaps so heavily, a heat pump costs only a little more than a comparable AC, usually $1,000 to $2,000 more installed. What you get for that extra money is heat without burning gas. If you currently heat with electric resistance (baseboards or electric furnace), a heat pump will cut that heating bill sharply because it moves heat instead of generating it. You can size either one with the BTU calculator before you get quotes.
Which one is cheaper to run over a year?
It depends on what you would otherwise heat with. For cooling, a heat pump and AC of equal SEER2 cost the same to run. The difference shows up in winter. A heat pump delivers roughly 2 to 3 units of heat per unit of electricity, so it beats electric resistance heat every time and often beats propane and oil. Where cheap natural gas is available, a high-efficiency gas furnace can still win on raw winter cost, which is why the heat pump vs furnace math matters for your specific utility rates.
On incentives, do not count on a federal tax credit anymore. The federal 25C heat-pump tax credit expired for systems placed in service after December 31, 2025. For a 2026 install, your savings come from state rebate programs and local utility rebates, which can still be worth several hundred to a few thousand dollars. Check your current state and utility incentives before you sign, because a rebate can erase the heat pump price premium entirely.
When does a plain air conditioner still make more sense?
Buy an AC when you already have a furnace you trust and you live somewhere with cheap natural gas and hard winters. If your gas furnace is newer and works well, replacing only the failed AC condenser is the cheaper move than converting the whole system to a heat pump. You keep proven winter heat and spend less today.
An AC also wins when you only need to cool one or two rooms and central heat is not part of the picture. A window unit or portable AC handles a spare bedroom or garage for a few hundred dollars, no installer required. For whole-home comfort where you want one quiet system to do everything, though, the heat pump is the stronger long-term choice.
Heat pump wins on
- +Heats and cools from one outdoor unit, no separate furnace needed
- +Far cheaper to heat than electric resistance, often beats propane and oil
- +Cools exactly as well as an AC at the same efficiency rating
Air conditioner wins on
- +Lower upfront price than a comparable heat pump
- +Pairs with a cheap gas furnace, which can win on winter cost
- +Slightly longer lifespan since it runs only in summer
The verdict
Pick the heat pump for almost any full-system replacement. It cools just as well as an AC, adds efficient heating from the same equipment for only a modest premium, and frees you from a separate furnace. The only times a plain air conditioner still makes sense are when you have a good gas furnace plus cheap natural gas, or when you just need to cool one room. With the federal credit gone after 2025, lean on state and utility rebates to close the price gap.
Related: Heat Pump vs Furnace, BTU Calculator: size your system, Best Mini-Split Heat Pumps.
Frequently asked questions
Does a heat pump cool a house as well as an air conditioner?
Yes. A heat pump uses the same compressor, coils, and refrigerant cycle as an air conditioner, so at the same SEER2 rating it cools identically. There is no comfort penalty in summer.
Is a heat pump more expensive than an air conditioner?
A heat pump usually costs $1,000 to $2,000 more installed than a comparable air conditioner. You pay that premium for the ability to heat your home from the same unit, which often pays back through lower winter energy bills.
Do heat pumps work in cold weather?
Modern cold-climate heat pumps keep heating efficiently down to around 5 degrees F and below, and many include backup electric heat for the coldest snaps. In mild and moderate winters a standard heat pump handles the whole season on its own.
Can I get a federal tax credit for a heat pump in 2026?
No. The federal 25C Energy Efficient Home Improvement Credit expired for systems placed in service after December 31, 2025. In 2026, look to state rebate programs and your local utility for incentives, and check your current state and utility offers before buying.
Will a heat pump replace my furnace?
In mild and moderate climates a heat pump can replace a furnace entirely. In colder regions many homeowners keep the furnace as backup, creating a dual-fuel system that uses the heat pump most of the year and the furnace only on the coldest days.