Heat Pump Cop
Calculator
Results
- Heat output (kW)
- 9
- Heat output (BTU/h)
- 30,709.278
- Daily electricity use (kWh)
- 20
- Daily heat delivered (kWh)
- 72
- Daily cost
- 3.4
Energy results
| Heat output (kW) | 9 |
| Heat output (BTU/h) | 30,709.278 |
| Daily electricity use (kWh) | 20 |
| Daily heat delivered (kWh) | 72 |
| Daily cost | 3.4 |
formula-map diagram
- Heat output (kW)
- 9
- Heat output (BTU/h)
- 30,709.278
- Daily electricity use (kWh)
- 20
- Daily heat delivered (kWh)
- 72
- Daily cost
- 3.4
Energy relationship
Formula
Q_out = P_in × COP= 9
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
What does COP actually mean?+
Coefficient of Performance is the ratio of heat energy delivered to electrical energy consumed, so a COP of 3 means the heat pump delivers 3 units of heat for every 1 unit of electricity used. It's a measure of efficiency, not a fixed output level.
Why does COP drop in cold weather?+
Air-source heat pumps extract heat from outside air, and as outdoor temperature falls, there's less heat to extract and the compressor has to work harder, so COP declines. Many units also lose significant efficiency below freezing, sometimes needing supplemental resistance heat.
How do I convert COP into an energy bill estimate?+
Divide your required heating output (in kWh of heat) by the COP to get the electrical energy consumed, then multiply by your electricity rate. A COP of 3.5 needing 10,500 kWh of heat over a season would consume about 3,000 kWh of electricity.
Is a higher COP always better?+
Generally yes for efficiency, but COP is measured at a specific outdoor and indoor temperature, so comparing two units' COP only makes sense at the same test conditions. A unit with a higher COP at mild temperatures might still perform worse than another at extreme cold.
What's the difference between COP and HSPF or SEER?+
COP is an instantaneous efficiency ratio at one set of conditions, while HSPF (heating) and SEER (cooling) are seasonal averages that account for varying temperatures across a whole season. HSPF and SEER give a more realistic year-round efficiency picture than a single COP value.