Does a Heat Pump Replace Air Conditioning? Yes: One System for Heating and Cooling
Short answer: yes. An air-source heat pump is an air conditioner that can also run in reverse. Natural Resources Canada (NRCan) describes a heat pump as "fully reversible, meaning that it can both heat and cool your home, providing year-round comfort." In summer it pulls heat out of your house and dumps it outside, exactly like a central AC. In winter it flips direction and moves outdoor heat inside. If your air conditioner and furnace are both getting old, one heat pump can replace the AC entirely and do most or all of the furnace's job. See what rebates you qualify for.
How one machine does both jobs
NRCan explains that refrigerators, air conditioners and heat pumps all "operate using the same principles and technology." The key difference is one part, the reversing valve, which "controls the direction of flow of the refrigerant in the heat pump and changes the heat pump from heating to cooling mode or vice versa."
| Summer (cooling) | Winter (heating) | |
|---|---|---|
| Indoor coil acts as | Evaporator: absorbs heat from indoor air | Condenser: releases heat into indoor air |
| Outdoor coil acts as | Condenser: rejects heat outside | Evaporator: absorbs heat from outdoor air |
| Bonus | Dehumidifies; condensate drains away | Defrost cycles clear frost from the outdoor coil |
| Same as | A central air conditioner | Nothing a plain AC can do |
From NRCan's description of the cooling cycle: liquid refrigerant passes through the expansion device, goes to the indoor coil (the evaporator) where it "absorbs heat from the indoor air and boils," is compressed, and then "passes through the reversing valve to the outdoor coil, which acts as the condenser," where the heat is released outdoors. NRCan adds that the heat pump "also dehumidifies the indoor air" in cooling mode.
In heating mode the reversing valve sends the flow the other way, and the outdoor coil becomes the evaporator that collects heat from outside air. NRCan notes that air at -18°C still holds about 85% of the heat contained in air at 21°C.
The outdoor unit of an air-source heat pump, in NRCan's words, "looks and operates in the same manner as the outdoor portion of an air-conditioner."
Cooling efficiency: SEER and SEER2
Cooling efficiency is rated by SEER (seasonal energy efficiency ratio), now reported as SEER2 under the updated test procedure. NRCan defines SEER as total cooling over the season divided by total electricity used, "based on a climate with an average summer temperature of 28°C."
| Metric | Value | Source |
|---|---|---|
| Minimum for split-system central heat pumps (Canadian regulation) | SEER2 ≥ 14.3 and HSPF2 (Region V) ≥ 6.0 | NRCan Energy Efficiency Regulations |
| Minimum for split-system central air conditioners (standard under consideration, aligned with U.S.) | SEER2 13.4 | NRCan |
| Range in market-available heat pumps | SEER 14 to 42 | NRCan heat pump booklet |
| Cold-climate units | "some systems reaching SEERs up to 42, and HSPFs approaching 13" | NRCan |
In practice, the heat pump you buy for heating is often at least as efficient at cooling as a typical new air conditioner, and variable-speed cold-climate models rate higher still. Higher SEER2 means lower summer bills for the same cooling.
NRCan's tip for summer: set the indoor fan to low in cooling mode to improve dehumidification. For wall units, direct airflow toward occupants when cooling and downward when heating.
Replacing an old AC and furnace at the same time
This is the most common moment to switch. NRCan says heat pumps "are also an option when replacing existing air conditioning systems, as the incremental cost to move from a cooling-only system to a heat pump is often quite low."
Your options:
| Option | What you install | Notes |
|---|---|---|
| AC only, keep furnace | New central AC | No heating benefit; usually no heat pump rebate |
| Hybrid (dual-fuel) | Heat pump replaces AC; existing gas/oil furnace stays as backup | NRCan: "a good option... when a heat pump is installed as a replacement for a central air-conditioner." Heat pump and furnace don't run at the same time |
| All-electric | Heat pump replaces AC and furnace; electric backup strips or baseboards | NRCan notes a 200-amp service is normally required for an all-electric air-source heat pump |
| Ductless | Mini-splits heat and cool individual rooms | Good where there are no ducts; see ducted vs ductless |
Price check (QuoteSaver, Sept 2026): a furnace + 2.5-ton AC combo ran $7,523–$10,178, and a 3-ton cold-climate ducted heat pump $12,283–$16,618, before rebates and tax. The fair comparison is heat pump vs. furnace + AC, not heat pump vs. furnace alone. KeelFox puts a typical cold-climate ducted heat pump that replaces a furnace and central AC at about $15,800 (most installs $12,300–$20,500, before tax). More in heat pump costs.
The federal government's own framing: heat pumps "also provide air conditioning – vital protection in increasingly frequent extreme heat events."
The rebate angle: AC-only gets nothing, a heat pump can get thousands
A new central air conditioner generally isn't what these programs fund. Heat pumps are:
- Federal National Heat Pump Rebate: up to $10,000 below median income, $2,000 otherwise, for eligible cold-climate air-source heat pumps. Not open yet (CBC: early 2027). See how to apply.
- Ontario: up to $7,500 (non-gas homes) or $2,000 (Enbridge gas homes), see Ontario.
- BC: up to $13,000 income-qualified (fossil-fuel homes); BC Hydro $4,000 whole-home for electric homes, see BC.
- Quebec: up to $6,700 via LogisVert, see Quebec.
- Manitoba: $2,000 ducted / $1,500 ductless, see Manitoba.
Watch the fine print: some programs require the heat pump to provide a minimum share of heating (e.g., BC Hydro whole-home: 100% of heating needs at -5°C; Edmonton CEIP: ≥ 50% of the design heating load). Some exclude replacing an existing heat pump (Nova Scotia, Manitoba, and Quebec after equipment failure).
Sizing for both heating and cooling
NRCan recommends sizing with CSA F280-12 ("Determining the Required Capacity of Residential Space Heating and Cooling Appliances") and warns that an oversized heat pump "produces too much heat and the unit cycles on and off leading to discomfort, wear on the heat pump, and stand-by electric power draw." In Canada the heating load is usually larger than the cooling load, so a unit sized for winter may be bigger than your old AC. Variable-speed units help by running slowly in mild weather and summer. Ask your installer for an F280 calculation. Efficiency Manitoba even pays its registered suppliers a bonus for including one.
Lifespan and maintenance
- NRCan: air-source heat pumps have a service life of 15–20 years. Ground-source units last about 20–25 years.
- Typical warranties: one year parts and labour, plus 5–10 years on the compressor (parts), but these vary.
- Because it runs year-round, change or clean the filter every 3 months and book annual maintenance (NRCan).
FAQ
Do I still need an air conditioner if I have a heat pump?
No. An air-source heat pump provides cooling in summer the same way a central AC does. NRCan describes heat pumps as fully reversible.
Is a heat pump as good at cooling as a regular AC?
Canadian minimums for split-system heat pumps (SEER2 14.3) are at or above the corresponding AC standard (SEER2 13.4), and market units range up to SEER 42 according to NRCan.
Does a heat pump dehumidify in summer?
Yes. NRCan says moisture condenses on the indoor coil during cooling and drains away.
Can I replace just my AC with a heat pump and keep my furnace?
Yes. That's a hybrid system, and NRCan calls it a good option when a heat pump replaces a central air conditioner. Check whether your rebate program allows hybrid setups.
Will the federal rebate pay for an air conditioner?
The National Heat Pump Rebate covers eligible electric cold-climate air-source heat pumps, which provide cooling as well as heating. It is not described as covering cooling-only air conditioners.