COMMERCIAL PROJECT PLANNER · USER-ENTERED QUOTES · TRANSPARENT ASSUMPTIONS
Heat Pump Electricity Cost Calculator
Estimate annual heat-pump electricity use and operating cost from useful heat demand, seasonal COP/SPF and your local electricity tariff.
Estimate annual heat-pump electricity use
Enter your tariff or load an available country reference.
Useful heat demand and seasonal performance vary by climate, building fabric, emitters, controls, setpoints and equipment. This is not a sizing calculation.
The key input is useful heat demand
Do not substitute floor area directly for useful heat demand. A building heat-loss or energy model is more appropriate for sizing; this calculator is for operating-cost sensitivity.
Why seasonal COP matters
Seasonal performance includes the effect of changing outdoor conditions and system operation. A catalogue COP at one test point is not the same as seasonal performance.
Compare scope, assumptions and exclusions—not just the total price.
Use WattCostLab’s quote checklist before signing a contract. It helps you compare like-for-like project scope without claiming that a referral marketplace is active.
Frequently asked questions
Does WattCostLab supply a contractor price on this page?
No. Enter real quotes or local project estimates. The calculator is designed to make scope differences visible.
Should I size HVAC equipment from square footage alone?
No. Building load depends on climate, envelope, glazing, infiltration, internal gains and design conditions; use a proper load calculation for sizing.
Can Location change the energy tariff?
Where an official or configured country energy reference is available, the tool can load it as a starting point. You can overwrite it.
Interpretation check before using the result
Reviewed September 14, 2026. This is an operating-cost sensitivity model, not an HVAC sizing calculation. Use a building heat-loss assessment for equipment sizing. If resistance backup heat is significant, model it separately because its effective COP is close to 1 and it can raise cold-weather electricity use.
State electricity-price benchmark
For U.S. scenarios, compare the electricity-rate input with Electricity Prices by State. Use the EIA-based state value as context and your actual utility tariff for a household-specific estimate.