Heat Pump Savings Calculator: Compare to Furnace & AC Costs
A homeowner in Nashville replaced a 20-year-old gas furnace and aging central AC with a Carrier Infinity 24VNA6 heat pump in October 2025. Their annual gas bill dropped from $1,240 to $0. Their electricity bill increased by $680/year. Net annual savings: $560 — before accounting for the eliminated AC repair budget of $300/year. After the $8,500 installation cost, payback is 9 years. That’s the baseline case. Swap “Nashville” for “Providence, RI” with oil heat, and the same swap saves $2,100/year — payback drops to 4 years.
The gap between those two scenarios — $560/year versus $2,100/year — is why generic “heat pumps save money” claims are only half the story. The savings depend entirely on what you’re replacing, where you live, and what your utility charges per kWh.
Key Takeaways
- ✓Heat pump annual savings range from $100–$400/year replacing natural gas to $1,500–$2,500/year replacing oil heat — the fuel type you’re leaving determines the economics
- ✓The critical threshold: when your electricity-to-gas cost ratio ($/MMBtu) divided by heat pump COP is below the gas furnace cost/AFUE ratio, the heat pump wins on operating cost
- ✓2026 EIA national average electricity rate: $0.1765/kWh. Natural gas: $1.05/therm. These vary enormously by state — Louisiana pays $0.09/kWh; California pays $0.35+/kWh
- ✓Heat pumps replace both furnace and AC — the correct comparison is total annual HVAC cost, not heating alone
- ✓Cold-climate heat pumps (HSPF2 10+) save 25–35% more on heating electricity than standard units — the efficiency premium pays back quickly in cold climates
The Core Savings Formula
Heat pump savings calculations have two components: the heating season and the cooling season. Most people focus only on heating, but the correct calculation accounts for both — because a heat pump replaces both your furnace and your air conditioner.
Heating Cost Formula
Annual Heating Cost (Heat Pump):
= Annual Heating Load (MMBtu) ÷ COP × ($/kWh ÷ 0.00341)
Annual Heating Cost (Gas Furnace):
= Annual Therms Used × $/therm ÷ AFUE
0.00341 = MMBtu per kWh conversion factor (1 kWh = 0.003412 MMBtu)
For a concrete example: a 2,000 sq ft home in Nashville (approximately 3,500 heating degree days) has an annual heating load of roughly 35 million BTU (35 MMBtu). With natural gas at $1.05/therm and a 95% AFUE furnace, annual heating cost:
35 MMBtu ÷ 0.95 AFUE × $1.05/therm × (1 therm = 0.1 MMBtu) = $386/yr gas cost
At $1.05/therm and 95% AFUE, effective cost = $1.105/therm delivered. 350 therms × $1.105 = $386/yr.
The same home with a heat pump at seasonal COP 2.8 and $0.1765/kWh electricity:
35 MMBtu ÷ 2.8 COP = 12.5 MMBtu electricity needed = 3,663 kWh × $0.1765/kWh = $646/yr
At Nashville’s 2026 Tennessee average electricity rate of $0.1240/kWh, this drops to $454/yr — saving only $68/yr heating costs vs gas.
This illustrates the critical point: In Tennessee where electricity is cheap ($0.1240/kWh) and natural gas is affordable, replacing a modern gas furnace with a heat pump saves very little on heating alone. The real case for a heat pump in that climate is (a) eliminating the AC system cost and (b) environmental motivation — not raw heating cost savings.
2026 Energy Prices by Fuel Type
Per the U.S. Energy Information Administration’s Electric Power Monthly and Natural Gas Monthly data for early 2026, the national average residential energy prices are:
| Fuel | 2026 Nat’l Avg Price | Cost per MMBtu | Range by State |
|---|---|---|---|
| Electricity | $0.1765/kWh | $51.7/MMBtu | $0.09 (LA) — $0.35+ (CA, HI) |
| Natural gas | $1.05/therm | $10.5/MMBtu | $0.70 (TX) — $2.10 (HI) |
| Heating oil (#2) | $3.20/gallon | $22.9/MMBtu | $2.80 (US South) — $4.20 (ME) |
| Propane | $2.95/gallon | $32.3/MMBtu | $2.20 (TX) — $4.50 (rural NE) |
These national averages mask wide state-level variation. Your local electricity rate is the single most important number in any heat pump savings calculation. Our electricity cost calculator uses current EIA state-level rates automatically — enter your ZIP code to get the right rate for your market.
| State | Avg Electricity Rate | Heat Pump Heating ($/MMBtu at COP 3.0) | Heat Pump Advantage |
|---|---|---|---|
| Louisiana | $0.09/kWh | $8.80/MMBtu | Beats all fuels |
| Tennessee | $0.124/kWh | $12.1/MMBtu | Beats oil/propane, ~tie with gas |
| Texas | $0.145/kWh | $14.2/MMBtu | Beats oil/propane; gas slightly cheaper |
| Massachusetts | $0.310/kWh | $30.3/MMBtu | Beats oil only (MA oil avg $4.00/gal) |
| California (PG&E territory) | $0.350+/kWh | $34.2/MMBtu | Gas may be cheaper for heating alone |
| Colorado | $0.148/kWh | $14.5/MMBtu | Competitive with gas; clear win vs propane |
COP and HSPF2 Explained: Why Efficiency Ratings Matter
Coefficient of Performance (COP) is the instantaneous efficiency of a heat pump — how many units of heat it delivers per unit of electricity consumed. HSPF2 (Heating Seasonal Performance Factor, 2nd generation) is the standardized seasonal efficiency rating used in the U.S. for regulatory and comparison purposes.
Converting HSPF2 to approximate seasonal COP: divide HSPF2 by 3.412.
| HSPF2 Rating | Approx Seasonal COP | Annual kWh (2,000 sq ft, Zone 5) | Annual Heating Cost ($0.1765/kWh) |
|---|---|---|---|
| HSPF2 7.5 (min DOE standard) | 2.20 | ~4,545 kWh | $802/yr |
| HSPF2 8.8 (typical mid-tier) | 2.58 | ~3,876 kWh | $684/yr |
| HSPF2 10.0 (cold-climate entry) | 2.93 | ~3,413 kWh | $602/yr |
| HSPF2 12.0 (premium cold-climate) | 3.52 | ~2,841 kWh | $501/yr |
The difference between a minimum-standard HSPF2 7.5 unit and a premium HSPF2 12 unit is $301/year in heating electricity — approximately $4,500 over the system’s 15-year life. Given that premium cold-climate units like the Mitsubishi Hyper-Heat or Bosch IDS Premium cost roughly $1,000–$2,500 more upfront, the efficiency premium typically pays back in 4–8 years in cold climates.
For a comprehensive breakdown of heat pump types and running costs, see our heat pump cost guide which covers all system types and brands.
Savings by Fuel Type: Worked Examples
All examples use a 2,000 sq ft home in ASHRAE climate zone 5 (approximately 5,500 heating degree days — Chicago, Denver, Indianapolis), a cold-climate heat pump at seasonal COP 3.0, and EIA 2026 national average energy prices. The heat pump also replaces a SEER2 14 central AC system.
Replacing Oil Furnace (85% AFUE) + Central AC (SEER2 14)
Current System Annual Cost:
- Heating (oil): ~900 gal × $3.20 = $2,880
- Cooling (AC): ~1,200 kWh × $0.1765 = $212
- Total: $3,092/yr
Heat Pump Annual Cost:
- Heating: ~4,000 kWh × $0.1765 = $706
- Cooling: ~950 kWh × $0.1765 = $168
- Total: $874/yr
Annual Savings: $2,218/yr • Payback on $8,500 install: 3.8 years
Replacing Propane Furnace (95% AFUE) + Central AC (SEER2 14)
Current System Annual Cost:
- Heating (propane): ~650 gal × $2.95 = $1,918
- Cooling (AC): ~1,200 kWh × $0.1765 = $212
- Total: $2,130/yr
Heat Pump Annual Cost:
- Heating: ~4,000 kWh × $0.1765 = $706
- Cooling: ~950 kWh × $0.1765 = $168
- Total: $874/yr
Annual Savings: $1,256/yr • Payback on $8,500 install: 6.8 years
Replacing Natural Gas Furnace (95% AFUE) + Central AC (SEER2 14)
Current System Annual Cost:
- Heating (gas): ~630 therms × $1.05 = $662
- Cooling (AC): ~1,200 kWh × $0.1765 = $212
- Total: $874/yr
Heat Pump Annual Cost:
- Heating: ~4,000 kWh × $0.1765 = $706
- Cooling: ~950 kWh × $0.1765 = $168
- Total: $874/yr
Annual Savings: ~$0 at national average gas prices • In high-electricity states (CA: $0.35/kWh), heat pump costs ~$700/yr more
Replacing Electric Resistance Heat + Central AC (SEER2 14)
Current System Annual Cost:
- Heating (resistance): ~12,000 kWh × $0.1765 = $2,118
- Cooling (AC): ~1,200 kWh × $0.1765 = $212
- Total: $2,330/yr
Heat Pump Annual Cost:
- Heating: ~4,000 kWh × $0.1765 = $706
- Cooling: ~950 kWh × $0.1765 = $168
- Total: $874/yr
Annual Savings: $1,456/yr • Payback on $8,500 install: 5.8 years
Savings by Climate Zone
Climate zone affects heating load — how many BTUs your home needs annually. Higher heating degree days mean more energy for heating and, consequently, higher potential savings. All figures below assume replacing oil heat (the scenario with clearest positive economics) and a 2,000 sq ft home.
| City / Climate | HDD/yr | Oil Cost/yr | Heat Pump Cost/yr | Annual Savings |
|---|---|---|---|---|
| Portland, ME (Zone 6) | 7,511 | $4,160 | $1,120 | $3,040/yr |
| Boston, MA (Zone 5) | 5,634 | $3,360 | $2,400 | $960/yr* |
| Chicago, IL (Zone 5) | 6,497 | $3,680 | $860 | $2,820/yr |
| Philadelphia, PA (Zone 4) | 4,865 | $2,900 | $720 | $2,180/yr |
| Nashville, TN (Zone 4) | 3,578 | $2,100 | $510 | $1,590/yr |
| Atlanta, GA (Zone 3) | 2,991 | $1,760 | $430 | $1,330/yr |
*Boston heat pump cost is higher because MA electricity rates average $0.31/kWh — the high electricity rate partially offsets the heat pump’s efficiency advantage. Mass Save rebates of up to $8,500 significantly improve the economics in Massachusetts.
Heat Pump Savings Calculators: What’s Available
Several tools can model heat pump savings for your specific situation. Here is an honest comparison of the main options:
| Calculator | Strengths | Limitations | Best For |
|---|---|---|---|
| Mass Save Heating Comparison | EIA data, multiple fuel types, rebates included | Massachusetts-specific; uses MA $0.31/kWh rate | New England homeowners |
| SWEEP Heat Pump Calculator | State-level EIA rates, compares gas + electric; transparent methodology | Southwest states focus; fewer climate zone options | Western states (CO, AZ, NV) |
| PickHVAC Gas vs Heat Pump | DOE + EIA data auto-populated by state; easy UI | Less granular on system efficiency tiers; no oil/propane option | Gas-to-heat-pump comparisons |
| MassLandlords Heat Pump Calculator | Transparent math; shows COP assumptions; good for landlords | Boston-area pricing focus; requires manual rate entry | Investment property analysis |
| JouleIO Heat Pump Calculator | Covers all 50 states, all fuel types, system efficiency tiers, integrated incentive data | Less customizable than manual spreadsheet for edge cases | National audience, quick estimates |
For the most comprehensive analysis, use two calculators — one local/utility-specific (like Mass Save if you’re in Massachusetts) and one national tool for comparison. Run our heat pump savings calculator with your actual utility rate and current heating fuel to get a personalized estimate.
Key Variables That Most Affect Your Results
When you run a heat pump savings calculation, four variables drive 90% of the outcome:
1. Your local electricity rate
The single biggest variable. It varies 4:1 across U.S. states. Before running any calculation, look up your actual utility rate — not the national average. Find it on your utility bill (look for "energy charge" in cents/kWh) or our electricity rates by state page. A $0.05/kWh difference in your rate changes annual savings estimates by $175–$300/year for a typical home.
2. Current heating fuel type and price
Oil and propane users almost always save significantly. Gas users in low-electricity-rate markets may save little on heating alone. Electric resistance heat users save a lot. The spread between your current fuel cost (per MMBtu) and heat pump electricity cost (per MMBtu at COP 3.0) is your savings per unit of heat.
3. Your annual heating load
This is how many BTUs your home actually needs to stay warm each year. It depends on climate zone (heating degree days), home size, and insulation level. Your utility bills are the most accurate source — annual therms of gas or gallons of oil directly reflects your heating load. Rough rule: 1 therm gas = 100,000 BTU of heating load (before furnace efficiency).
4. Heat pump efficiency tier
A premium HSPF2 12 cold-climate unit saves 25–35% more heating electricity than a minimum-standard HSPF2 7.5 unit. The premium cost of $1,000–$2,500 pays back in 4–8 years in climate zones 4–6. In warm climates (zones 1–3), the efficiency difference matters less because heating loads are small.
The Complete HVAC Cost Comparison
The most accurate comparison is total HVAC lifecycle cost — installation plus 15 years of operation. A heat pump replaces two systems; its competitors (furnace + AC) require two separate replacements. Here is the complete picture at national average energy prices:
| System | Install Cost | Annual Operating | 15-yr Total |
|---|---|---|---|
| Heat pump (HSPF2 10, replacing gas) | $8,500 | $874/yr | $21,610 |
| Gas furnace (95% AFUE) + Central AC | $11,000 | $874/yr | $24,110 |
| Heat pump (replacing oil) | $8,500 | $874/yr | $21,610 |
| Oil furnace (85% AFUE) + Central AC | $12,500 | $3,092/yr | $58,880 |
Against oil heat, the lifecycle cost advantage of a heat pump over 15 years exceeds $37,000 — a dramatically compelling economic case. Against natural gas, the comparison is close but still favors the heat pump when you factor in lower installation cost (one system vs two) and future gas price risk.
For a detailed breakdown of heat pump vs furnace performance across all efficiency metrics, our dedicated comparison guide covers HSPF2, SEER2, AFUE, and COP in one place.
Frequently Asked Questions
How much money does a heat pump save per year?
Annual savings depend on what you're replacing. At 2026 EIA average prices, switching from a 95% gas furnace saves $100–$400/year in most markets. Switching from oil heat saves $1,500–$2,500/year. Switching from propane saves $900–$1,400/year. Switching from electric resistance saves $1,200–$1,800/year. The higher the cost of the fuel you're leaving, the larger your savings.
What is the electricity-to-gas price ratio, and why does it matter?
This ratio compares energy costs per equivalent unit of heat. At $0.1765/kWh electricity and $1.05/therm gas, electricity costs $51.7/MMBtu vs gas at $10.5/MMBtu. The heat pump's COP of 3.0 brings its effective cost to $17.2/MMBtu — competitive but still above natural gas. The ratio determines whether a heat pump beats gas on operating cost in your specific market.
Does a heat pump save money compared to central AC?
Modern heat pumps at SEER2 18 use 15–20% less electricity for cooling than a standard SEER2 14–15 central AC. For a 2,000 sq ft home running AC 1,400 hours/year, this saves $30–$80/year on cooling. The bigger saving is that a heat pump replaces both furnace and AC with one system — eliminating the $4,000–$7,000 cost of a separate central AC replacement when your existing unit fails.
How do I calculate heat pump savings for my home?
Look up your annual fuel consumption on utility bills (therms, gallons, or kWh). Multiply by current fuel price to get annual HVAC cost. Calculate heat pump annual cost: Annual BTU load ÷ (3.412 × COP) = kWh needed × $/kWh = operating cost. The difference is annual savings. Use our heat pump calculator for an automated version with current EIA rates.
Are heat pump savings better in cold or warm climates?
In absolute dollar terms, savings are highest in cold climates (high heating loads) where you're replacing expensive fuels. The Northeast replacing oil heat has the most compelling economics. In warm climates, heating loads are low so absolute savings are modest, but the heat pump still beats electric resistance and simplifies your HVAC to one system. Climate zone matters more when replacing gas vs when replacing oil.
Which is cheaper to run, a heat pump or a gas furnace?
At national average 2026 prices, a heat pump at COP 3.0 delivers heat at $17.2/MMBtu versus a 95% AFUE gas furnace at $11.1/MMBtu. Gas is cheaper per unit of heat in most U.S. markets. But heat pumps replace both furnace and AC — when you compare total annual HVAC costs (heating + cooling), heat pumps are competitive with or cheaper than separate gas + AC systems in most markets.
What factors most affect heat pump savings calculations?
The four biggest variables: (1) Local electricity rate — ranges from $0.09/kWh in Louisiana to $0.35+/kWh in California. (2) Current heating fuel — oil and propane replacements save dramatically more than gas. (3) Climate zone heating load — more HDD means more potential savings. (4) System COP — a HSPF2 12 unit saves $300/year more on heating electricity than a HSPF2 7.5 minimum-standard unit over a 15-year system life.
Calculate Your Specific Heat Pump Savings
Enter your home size, current fuel type, local electricity rate, and climate zone to get a personalized annual savings estimate and payback period.
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