Heat Pump Payback Calculator
Compare an existing heating system with a heat pump using annual thermal demand, efficiency, COP, energy prices, installed cost, incentives and maintenance savings.
Default project preview
3.89 years
Current annual heating cost
$2,823.53
Heat-pump annual cost
$1,125.00
Net investment
$7,000.00
Annual electricity use
6,250 kWh
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Annual delivered heating demand
Enter this project assumption in kWh thermal. The current imperial default is 20000 kWh thermal.
Current system efficiency
Enter this project assumption in %. The current imperial default is 85 %. Minimum: 1. Maximum: 100.
Current fuel energy price
Enter this project assumption in per kWh input. The current imperial default is 0.12 per kWh input. Minimum: 0.
Seasonal heat-pump COP
Enter this project assumption in a unitless value. The current imperial default is 3.2.
Electricity price
Enter this project assumption in per kWh. The current imperial default is 0.18 per kWh. Minimum: 0.
Installed heat-pump cost
Enter this project assumption in a unitless value. The current imperial default is 9000. Minimum: 0.
Rebate or incentive
Enter this project assumption in a unitless value. The current imperial default is 2000. Minimum: 0.
Annual maintenance savings
Enter this project assumption in a unitless value. The current imperial default is 100. Minimum: 0.
How to read the outputs
Current annual heating cost
85% efficiency. Default preview: $2,823.53.
Heat-pump annual cost
seasonal COP 3.2. Default preview: $1,125.00.
Net investment
installed cost minus incentive. Default preview: $7,000.00.
Annual electricity use
thermal demand divided by COP. Default preview: 6,250 kWh.
First-year return
simple savings / investment. Default preview: 25.7%.
Ten-year net savings
constant-price simple estimate. Default preview: $10,985.29.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Current cost = thermal demand ÷ current efficiency × fuel price. Heat-pump cost = thermal demand ÷ COP × electricity price. Payback = net investment ÷ annual savings.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: July 30, 2026
Use the Heat Pump Payback Calculator to estimate a planning quantity from verified installed cost difference, annual savings and maintenance assumptions. It supports scope comparison, purchasing and operating-cost planning, but it does not select equipment, approve code compliance or replace project-specific design.
Calculation steps
- 1Measure or obtain each design input from the actual project and keep one consistent unit system.
- 2Enter installed cost difference, annual savings and maintenance assumptions using product data or approved design information rather than generic nominal values.
- 3Review the unrounded engineering or usage result before applying allowances, duty cycle, efficiency or tariff assumptions.
- 4Apply each adjustment once, then round only the final purchasing, equipment-count or scheduling output.
Worked numerical example
If a heat-pump project costs $4,500 more than the alternative and saves an estimated $900 per year, simple payback is 5 years before financing, maintenance or energy-price changes.
Purchasing and rounding
Compare installed alternatives on the same scope and include rebates consistently. Treat maintenance, financing and residual value separately when a simple-payback result is not enough for the decision.
Interpret the result
Simple payback divides incremental cost by annual savings. It ignores discount rate and future price changes, so it is a screening metric rather than a full life-cycle financial analysis.
Page-specific assumptions
- Inputs describe the actual connected system or measured project scope.
- One operating condition, product rating and unit system are used per calculation.
- Allowances and efficiency losses are not already embedded in the entered values.
- Code, health, structural, electrical and hydraulic requirements are verified independently.
Common mistakes
- Using nominal equipment ratings instead of delivered performance at design conditions.
- Mixing instantaneous flow or power with daily or annual energy.
- Applying the same allowance more than once.
- Treating a quantity or cost estimate as equipment selection or professional approval.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Heat Pump Payback Calculator questions
Why use seasonal COP rather than rated COP?+
Seasonal performance better reflects changing outdoor temperatures, cycling and defrost operation.
Should cooling savings be included?+
They can be added separately when the heat pump replaces an older cooling system, but they are not included here.
Can energy prices change the payback?+
Yes. The result is sensitive to both electricity and existing-fuel prices.