Heat Pump Savings Calculator - Payback Period and Annual Savings

Your heating bill before and after a heat pump

Enter your current annual heating cost, the heat pump's COP, your electricity rate and the installation price. The calculator shows your annual savings, payback period with any rebate, and net savings over 10, 15 and 20 years. A side-by-side comparison table covers seven fuel types so you can see exactly where a heat pump sits in the ranking.

How to use - step by step

Current heating source - select your primary fuel. If you use two sources, pick the one with the higher annual cost.
Annual heating cost - total spent on heating over the last 12 months including hot water. Sum all fuel bills.
Heated area - living space in square feet. Do not count unheated garage or basement.
COP / SCOP - seasonal efficiency of the heat pump. Air-source typically 2.8-4.0, ground-source 3.8-5.5.
Electricity price - your rate per kWh. US average is about $0.16.
Installation cost - total price including unit, labor, ductwork and tank. Air-source: $12,000-$25,000.
Rebate - federal IRA credit (30%, up to $2,000/year), state rebates, utility incentives.
Read results - annual savings, payback, long-term net gain, fuel comparison and CO2 reduction.

Before and after - what changes

Before (gas furnace)

Annual cost: $2,400
Cost per kWh of heat: $0.04
CO2: 12,000 kg/year
Over 15 years: $36,000

After (heat pump, COP 3.5)

Annual cost: $2,743
Cost per kWh of heat: $0.046
CO2: 5,040 kg/year
Over 15 years: $41,143

Wait - in this example gas is actually cheaper than a heat pump at $0.16/kWh electricity? Yes. Gas at $0.04/kWh is hard to beat even with COP 3.5. The savings depend heavily on your fuel type. Oil at $0.07/kWh or propane at $0.10/kWh? The pump wins easily. The calculator runs the comparison for all seven sources at once.

Cost per kWh of delivered heat by fuel type

Heating source	Typical $/kWh	Efficiency	Notes
Natural gas (condensing)	$0.03-0.05	92-96%	Cheapest fossil fuel in most US markets
Natural gas (old furnace)	$0.05-0.07	78-85%	15-30% more fuel than condensing
Heating oil	$0.06-0.09	83-87%	Common in Northeast US
Propane	$0.08-0.12	85-95%	Rural areas without gas mains
Electric (baseboard)	$0.12-0.25	100%	COP 1.0 - most expensive per kWh
Wood / pellet	$0.02-0.05	70-85%	Cheap fuel, high labor
Heat pump (COP 3.5)	$0.04-0.05	350%	$0.16/kWh electricity, COP 3.5

Practical examples

Example 1: Oil heating, $3,600/year, 1,800 sq ft, air-source COP 3.2, $18,000 install, $5,400 IRA credit
Savings: $2,057/year, payback 6.1 years, net gain over 15 years: $18,255

Example 2: Propane, $4,200/year, 2,200 sq ft, ground-source COP 4.5, $32,000 install, $9,600 credit
Savings: $2,707/year, payback 8.3 years, net gain over 15 years: $18,205

Example 3: Electric baseboard, $5,000/year, 1,500 sq ft, air-source COP 3.0, $15,000 install, $4,500 credit
Savings: $3,333/year, payback 3.1 years, net gain over 15 years: $39,500

Example 4: Gas condensing, $1,800/year, 1,400 sq ft, air-source COP 3.5, $16,000 install, $4,800 credit
Savings: $514/year, payback 21.8 years - marginal case, pump barely beats modern gas

Example 5: Old gas furnace, $3,000/year, 2,000 sq ft, ground-source COP 4.8, $35,000 install, $10,500 credit
Savings: $1,667/year, payback 14.7 years, net gain over 20 years: $8,840

FAQ - Frequently asked questions

How much does a heat pump save per year?

It depends on your current fuel. Switching from oil or propane typically saves $1,500-$3,000/year. From electric baseboard: $2,000-$4,000. From modern gas: $200-$800 - the smallest gap because gas is already cheap per kWh.

What is COP and why does it matter?

COP (Coefficient of Performance) measures how much heat a pump delivers per unit of electricity. COP 3.5 means for every 1 kWh of electricity, you get 3.5 kWh of heat. Higher COP = lower operating cost. Air-source pumps average 2.8-4.0, ground-source 3.8-5.5.

Does the federal tax credit apply to heat pumps?

Yes. The Inflation Reduction Act (IRA) provides a 30% tax credit on qualified heat pump installations, up to $2,000 per year for air-source and uncapped for geothermal. Many states add their own rebates. Check dsireusa.org for local incentives.

Air-source vs ground-source - which saves more?

Ground-source (geothermal) has higher COP (4.0-5.5 vs 2.8-4.0) and more consistent performance in cold climates. But installation costs $20,000-$45,000 vs $12,000-$25,000 for air-source. The higher savings from ground-source often take 12-18 years to offset the price difference.

Do heat pumps work in cold climates?

Modern cold-climate air-source heat pumps (e.g. Mitsubishi Hyper-Heating) operate down to -13F (-25C). COP drops to 1.5-2.0 at those temperatures, but they still beat electric resistance heating. Ground-source pumps are unaffected by air temperature.

How long does a heat pump last?

Air-source heat pumps typically last 15-20 years. Ground-source units last 20-25 years, and the ground loop can last 50+ years. Maintenance cost is about $200-$400/year - filter changes, refrigerant check, coil cleaning.

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