Home & Construction
Heat Pump Savings Calculator
Estimate current heating cost, heat-pump electricity use and cost, annual operating savings, net installed cost, simple payback, and horizon savings. The energy-path visual traces useful heat backward to each fuel input.
Estimated annual operating savings-
Heat-pump electricity use (kWh)-
Current annual heating cost-
Heat-pump annual electricity cost-
Simple payback period-
Operating savings over horizon-
Decision view
Useful-heat energy and cost pathways
Useful-heat energy and cost pathwaysThe same useful heating demand is traced through current-system efficiency and heat-pump COP before operating costs are compared.
Exact scenario comparisonElectricity price per kWh changes while all other entered assumptions remain constant.
| Electricity price per kWh | Estimated annual operating savings | Heat-pump electricity use (kWh) | Current annual heating cost | Heat-pump annual electricity cost | Simple payback period | Operating savings over horizon |
|---|
Period-by-period detail
Monthly schedule and annual summary
How to use Heat Pump Savings Calculator
- Estimate annual useful heat from bills or a calibrated building model.
- Use seasonal—not nameplate—COP for the climate and distribution temperature.
- Add installation, incentives, backup heat, tariff changes, maintenance, and financing before deciding.
Calculator guide
Understanding Heat Pump Savings Calculator
Heat-pump savings compare the cost of delivering the same useful heat with two systems. Efficiency and COP must be applied to useful demand before energy prices are compared.
Calculation method
How the calculation works
Convert useful heat demand to current fuel input and heat-pump electricity input, value both at entered rates, and compare annual operating cost with net installed cost. Divide useful heat by current efficiency for current fuel input and by seasonal COP for heat-pump electricity. Value each input at its entered rate, subtract costs for annual savings, and divide net installed cost by positive savings for simple payback.
System fit
Check performance at the design temperature
Annual economics can look favorable while peak-day operation still needs attention.
Worked situations
Practical examples
- 18,000 kWh of useful heat at 90% efficiency needs 20,000 kWh of current fuel input.
- At COP 3.2, the heat pump uses about 5,625 kWh.
- Entered rates produce roughly $675 annual savings and a simple payback near 20.7 years on $14,000 net cost.
Better inputs
Useful tips
- Model colder-weather COP and backup operation separately.
- Use marginal electricity tariffs when heating changes consumption tiers or peak charges.
- Evaluate envelope improvements that reduce both required capacity and operating cost.
Before relying on the result
Limitations and common mistakes
- Useful heat, efficiency, COP, and energy prices are constant annual values.
- Defrost, backup heat, distribution changes, maintenance, financing, degradation, and replacement timing are excluded.
- Simple payback ignores discounting and equipment residual value.
Reference
Key terms
- Useful heat
- Heat delivered to the building after system conversion losses.
- COP
- Useful heat delivered per unit of electricity consumed.
- Net installed cost
- Entered installation cost minus entered incentives.
- Simple payback
- Net cost divided by annual operating savings without discounting.
Important note
Calculated from the entered measurements and stated coverage or quantity rules. Confirm field dimensions, waste, product requirements, structural conditions, and local codes before purchasing or building.
Frequently asked questions
Why divide useful heat by COP?
COP states how many units of useful heat are delivered per unit of electricity.
Can COP stay constant in winter?
No. Real COP varies with outdoor temperature, supply temperature, cycling, and defrost.
Are rebates treated as savings?
They reduce entered upfront cost; they do not reduce annual operating energy.
What if annual savings are negative?
Simple payback is not meaningful when the modeled heat pump costs more to operate.