Heat pump vs air conditioner
A heat pump and an air conditioner cool your home the same way — but a heat pump can also reverse to heat it. Here is how they compare.
The core difference
An air conditioner and a heat pump use the same refrigerant cooling cycle and cool a home identically. The difference is one part: a heat pump adds a reversing valve, so it can run the cycle backwards and heat your home in winter too. An AC only cools; a heat pump cools and heats. That dual role is why a heat pump is sometimes called an "A/C heat pump system" or an air-conditioner-heater.
| Heat pump | Air conditioner | |
|---|---|---|
| Cools? | Yes | Yes |
| Heats? | Yes | No (needs a furnace) |
| Cooling efficiency | SEER2 (same scale) | SEER2 (same scale) |
| Upfront cost | Slightly higher | Slightly lower |
Cost & efficiency
For cooling, a heat pump and an AC of the same SEER2 use about the same electricity — cooling performance is essentially identical. A heat pump costs a little more upfront for the reversing valve and controls, but it replaces a separate furnace, so the whole-home heating-and-cooling cost is often comparable or lower. Use our cost calculator to compare.
Which should you choose?
If you need to replace your AC and your heating system is aging — or you want to electrify and cut emissions — a heat pump is usually the better buy, since it does both jobs. If your furnace is new and gas is very cheap where you live, a standalone AC can make sense. A dual-fuel system (heat pump + gas furnace) is a popular middle ground in cold climates.
Frequently asked questions
Is a heat pump just an air conditioner that heats?
Essentially yes — it uses the same cooling cycle as an AC, plus a reversing valve that lets it run backwards to heat your home in winter.
Does a heat pump cool as well as an AC?
Yes. At the same SEER2 rating, a heat pump cools just as efficiently and effectively as an air conditioner.
Is a heat pump more expensive than an AC?
A little more upfront, but it replaces both your AC and your furnace, so total heating-and-cooling cost is often comparable.
Related
Sources & further reading
Educational guide, reviewed against US DOE & ENERGY STAR guidance and updated June 2026. Estimates only — not a substitute for a professional assessment or Manual J load calculation.