Comparison
Heat pump vs AC
In cooling mode they are the same machine. The question is what heats your house in winter.
Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short answer
Heat pump vs AC comes down to one part. A heat pump is an air conditioner with a reversing valve, so it can move heat into the house in winter as well as out of it in summer.
Cooling performance is rated the same way for both. Choose a heat pump when you want it to carry some or all of your heating; choose an AC when a furnace or boiler already does that job well.
How do a heat pump and an AC differ mechanically?
They share almost every part. Both have an outdoor unit with a compressor and coil, an indoor coil, refrigerant lines and a blower. In summer both pull heat out of indoor air and dump it outside. That is why both carry a SEER2 cooling rating measured under the same federal test.
The heat pump adds a reversing valve and defrost controls. The valve flips the direction the refrigerant flows, so the outdoor coil gathers heat from outside air and the indoor coil releases it.
Because it moves heat rather than making it, a heat pump can deliver more heat energy than the electricity it uses. Its heating efficiency is rated as HSPF2, a number an AC simply does not have.
In cold weather the outdoor coil can frost over, so a heat pump periodically runs a defrost cycle. An AC never needs one because it shuts off for the winter.
Heat pump vs AC at a glance
| Heat pump | Air conditioner | |
|---|---|---|
| Cooling | Yes, same cycle as an AC | Yes |
| Heating | Yes, by moving outdoor heat inside | No; needs a furnace, boiler or other heat |
| Efficiency ratings | SEER2 and EER2 for cooling, HSPF2 for heating | SEER2 and EER2 only |
| Runs in winter | Yes, with defrost cycles | No |
| Backup heat | Electric strips or a gas furnace (dual fuel) in many homes | The furnace or boiler is the heat |
| Refrigerant | New systems use lower-GWP refrigerants such as R-454B or R-32 | Same |
Ratings for any specific pairing come from the AHRI Directory, not from a brochure.
What drives the cost difference?
A heat pump outdoor unit carries more parts than a comparable AC, so the equipment line is usually higher.
What decides the total is the rest of the job: whether the ducts and indoor coil can be reused, whether the electrical panel has room, whether backup heat is needed, and how much labor the site needs.
A heat pump can also replace two systems at once if it takes over heating, which changes the comparison entirely.
Running costs depend on your local electricity and fuel prices and your climate. In a house with gas heat, the comparison is against the furnace bill, not the AC.
We publish no prices here: we do not yet hold enough sourced, dated quotes to state one honestly. Use the cost hub and the HVAC cost calculator with your own quotes.
Which one fits your house?
Choose a heat pump when
Your heat is electric resistance (baseboard or an electric furnace). A heat pump can deliver the same heat with less electricity.
You have no gas line, or you plan to stop using one.
You are replacing the AC anyway and want a second source of heat. Paired with a furnace it becomes a dual-fuel system.
Choose an AC when
A working, efficient furnace or boiler already heats the house and you only need cooling.
Your winters are long and very cold and you have no plan to add backup heat. A cold-climate heat pump can work there, but it must be sized and specified for it.
The panel cannot take the extra load and an upgrade is not planned.
Questions to put to any installer
Sizing should come from a room-by-room load calculation, not the size of the old unit.
The outdoor unit and indoor coil are rated together. Ask for the matched-system reference.
Ask what output the unit holds at your design temperature and what backup heat covers the gap.
Only an EPA Section 608 certified technician may connect gauges or charge the system.
Where does each one genuinely win?
The AC wins on simplicity when good heat already exists: fewer controls, no defrost, nothing running in winter.
The heat pump wins when the heat you have is expensive or ageing, because one outdoor unit covers both seasons. Neither is better in the abstract.
The deciding question is what you heat with today and what that costs you.
Questions
Is a heat pump just an AC that runs backwards?
Does a heat pump cool as well as an AC?
Can a heat pump replace my furnace?
Do heat pumps work in cold climates?
Which lasts longer?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify.
The counts below are generated from the published pages themselves, last counted October 26, 2026, and they are what we have actually published rather than what we intend to.
- 18
- studies published
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- federal sources read and cited
- 15
- studies published with their full dataset as CSV
- 51
- jurisdictions reproduced against EIA’s own tables
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Data as of Sources checked October 26, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
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