Low 2.0 3.0
Good 4.0 5.0+
Excellent
Annual Cost Comparison
COP at Key Outdoor Temperatures
| Outdoor Temp | Est. COP | Heat Output (kW) | Power Input (kW) | Cost/kWh Heat | vs Gas Furnace |
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Full Analysis
| Parameter | Heat Pump | Gas Furnace |
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How to Use the Heat Pump COP Calculator
Enter rated COP at +8.3°C and -8.3°C, the two standard AHRI rating conditions on product spec sheets and Energy Star listings. The ratio between them shows how quickly the unit loses efficiency in the cold, a key differentiator for cold-climate units. Add HSPF if you have it, or check the Energy Star listing or NRCan CanmetENERGY database. If you're still choosing equipment, the heat pump sizing calculator can match capacity to your home's design-day load first.
Enter any outdoor temperature from -40°C to +20°C to see estimated COP at that condition, useful for checking performance on your coldest design days. For Edmonton's -29°C or Winnipeg's -28°C design temperature, a cold-climate unit rated to -30°C typically still delivers COP 1.5-1.9.
Enter your annual heat load, or convert gas usage: m3 x 37.5 MJ/m3 / 3.6 kWh/MJ x furnace AFUE (2,000 m3/yr at 0.96 AFUE = 20,000 kWh). Heat pump cost equals heat load divided by seasonal COP (HSPF / 3.412) times your electricity rate. For a full switch analysis including capital costs, use the heat pump vs gas calculator.
Heat Pump COP in Cold Canadian Climates: What the Data Shows
Heat pump performance in cold climates is more nuanced than a single COP number suggests. Understanding how COP varies with temperature, what drives that variation, and how to use seasonal metrics correctly is essential for evaluating heat pump economics in Canada; NRCan's own heat pump sizing and selection tools for HVAC professionals are built around these same cold-climate performance curves.
How COP Changes with Temperature
A heat pump moves heat from outside air (or ground) to inside. The greater the temperature difference between source and destination, the harder the compressor must work, and the lower the COP. This is governed by the Carnot efficiency limit: COP_max = T_hot / (T_hot - T_cold), where temperatures are in Kelvin. A heat pump delivering heat at 40°C to a home when it's +7°C outside has a Carnot limit of (273+40) / (40-7) = 9.5. The same unit at -20°C outdoors has a Carnot limit of (273+40) / (40-(-20)) = 5.2. Real heat pumps operate at 30-45% of the Carnot limit, so actual COPs at -20°C typically fall in the 1.5-2.5 range for modern CCHPs.
Cold-Climate Heat Pumps: What Makes Them Different
Standard single-stage heat pumps use a fixed-speed scroll compressor. At low outdoor temperatures, the suction pressure drops, refrigerant density falls, and mass flow rate decreases, reducing capacity faster than COP. Cold-climate heat pumps (CCHPs) address this with variable-speed (inverter-driven) compressors that can slow down or speed up to match the load, enhanced vapour injection (EVI) that adds a second expansion stage to boost refrigerant density at low temperatures, and optimized refrigerant blends (typically R-410A or newer low-GWP alternatives like R-32) for low-temperature operation; correct charge on these blends matters more than on older systems, and the refrigerant charge calculator covers the subcooling and superheat targets for each.
In Canada, CCHPs must meet Natural Resources Canada's cold-climate criteria, which includes maintaining at least 70% of rated capacity at -15°C. Models certified under this program include units from Mitsubishi (Hyper Heat), Daikin (Emura/LV series), Bosch, and Carrier, among others.
Seasonal COP vs. Point-in-Time COP
A single COP at one temperature is misleading for predicting annual costs. What matters is the weighted average COP across all hours of the heating season, which is what HSPF captures. In a Canadian climate with many hours near 0°C to -10°C and fewer hours at extreme cold, the seasonal COP is typically higher than the rated COP at -8.3°C and lower than the rated COP at +8.3°C. For a CCHP with HSPF 10, the seasonal COP is approximately 10 / 3.412 = 2.93. This is the number that should drive annual cost projections.
The Break-Even Electricity-to-Gas Price Ratio
The heat pump becomes cheaper to operate than a gas furnace when the electricity rate divided by the heat pump's seasonal COP is less than the cost of gas per kWh of delivered heat: (gas rate ÷ 37.5 MJ/m³) × 3.6 MJ/kWh ÷ AFUE. With gas at $0.35/m³ and a 96% AFUE furnace, that works out to about $0.035 per kWh of delivered heat. For a heat pump with a seasonal COP of 2.93 (HSPF 10), the break-even electricity rate is 2.93 × $0.035, or about $0.10/kWh. At Toronto's electricity rate of $0.13/kWh, a heat pump with only that seasonal COP actually costs slightly more to run than gas; a higher-HSPF cold-climate unit (HSPF 12-13, seasonal COP roughly 3.5-3.8) is needed to consistently beat gas at Toronto rates. At BC's lower electricity rate, even a standard-COP heat pump beats gas comfortably. In Alberta, where grid electricity can reach $0.20-0.22/kWh, gas usually keeps the cost edge unless the heat pump has a notably high seasonal COP. Use the fuel cost comparison tool for a current $/GJ comparison in your province, and enter your own unit's HSPF above for a rate matched to your actual equipment.
Dual-Fuel Systems for Cold Climates
For homes in Edmonton, Winnipeg, Saskatoon, or other extreme-cold climates with existing gas infrastructure, a dual-fuel system, a cold-climate heat pump for most of the heating season with a gas furnace as backup below a switchover temperature, often delivers the best combination of efficiency and reliability. The gas furnace fires once the heat pump's COP drops to the point where electricity costs more per kWh of delivered heat than gas. With electricity at $0.14/kWh and gas at $0.35/m³ (96% AFUE), that switchover COP is about 4.0, meaning the gas furnace may need to cover a meaningful share of cold-weather hours rather than only the most extreme days, depending on the specific heat pump's COP curve. Enter your own equipment's ratings and local rates above to find your household's actual switchover point. For a full comparison of heat pump and gas furnace economics, use the heat pump vs gas calculator.
Frequently Asked Questions
COP (Coefficient of Performance) is the ratio of heat delivered to electricity consumed. A COP of 3.0 means 3 kW of heat is produced for every 1 kW of electricity used. COP drops as outdoor temperatures fall because the heat pump must work against a larger temperature difference. At +7°C a modern cold-climate unit might achieve COP 3.5–4.5, while at -20°C it may deliver COP 1.5–2.2. Ground source heat pumps maintain a nearly constant COP year-round (typically 3.0–5.0) because ground temperature stays at 8–12°C regardless of outdoor air temperature.
HSPF (Heating Seasonal Performance Factor) is total seasonal heat output in BTU divided by total electricity consumed in watt-hours. It's effectively a seasonal average COP expressed in mixed units. To convert: COP_seasonal = HSPF / 3.412. So HSPF 10 = COP 2.93 seasonal average. Canada's current minimum efficiency regulation requires split-system central heat pumps to meet HSPF2 (Region V) of at least 6.0, tested under the newer Appendix M1 procedure adopted in 2025; that's a different, more conservative scale than the older HSPF rating still quoted on some spec sheets. Cold-climate heat pumps marketed for Canadian winters typically rate 9-13 on the older HSPF scale. HSPF is the most practical metric for annual energy cost calculations because it accounts for the full range of operating temperatures across the heating season.
Standard heat pumps lose meaningful capacity below -15°C to -20°C. Modern cold-climate heat pumps (CCHPs) maintain significant output to -25°C or -30°C. At -25°C, a CCHP typically delivers 50–70% of rated capacity with a COP of around 1.5–2.0. Ground source heat pumps don't have a low-temperature cutoff because they draw heat from the ground, which stays at 8–12°C year-round. For Canadian cities with design temperatures below -25°C (Edmonton -29°C, Winnipeg -28°C, Saskatoon -33°C), a backup heat source or oversized CCHP is recommended for design day coverage.
It depends on local electricity and gas rates, climate, and the heat pump's seasonal COP. Gas costs roughly $0.035 per kWh of delivered heat at $0.35/m³ and 96% AFUE. A heat pump beats that whenever its electricity rate divided by seasonal COP comes out lower: a seasonal COP of 2.93 (HSPF 10) needs electricity under about $0.10/kWh to beat gas. In BC, where electricity is $0.10-$0.13/kWh and winters are mild, heat pumps are usually competitive or cheaper. In Ontario and Quebec, with electricity at $0.13-$0.17/kWh, the outcome depends heavily on the specific unit: standard-COP heat pumps often run close to gas cost or slightly higher, while higher-HSPF cold-climate models can beat gas by a real margin. In Alberta, where electricity can reach $0.17-$0.22/kWh, gas usually keeps the cost advantage unless the heat pump has an unusually high seasonal COP. Use this calculator with your specific rates and equipment for an accurate comparison.
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