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In Boston, a cold-climate heat pump costs $1,100-1,400/year to heat a typical home at Eversource's $0.2836/kWh rate. A gas furnace costs $1,400-1,800/year at current National Grid gas rates (~$1.89/therm). Heat pumps save 15-30% annually while also providing AC, eliminating the need for a separate cooling system.
$2,319
Heat Pump Annual
Heating + Cooling
$2,070
Gas + AC Annual
Heating + Cooling
$-249
Annual Savings
With heat pump
$-7,855
10-Year Savings
Including equipment
This table shows month-by-month energy costs for a typical 2,500 sq ft Boston home. The heat pump handles both heating (COP 3.5) and cooling (SEER2 20). The gas system uses a 96% AFUE furnace for heating and a SEER2 16 central AC for cooling.
| Month | Heat Pump | Gas + AC | Savings | Winner |
|---|---|---|---|---|
| January | $427 | $354 | -$73 | Gas |
| February | $368 | $305 | -$63 | Gas |
| March | $285 | $236 | -$49 | Gas |
| April | $142 | $118 | -$24 | Gas |
| May | $58 | $58 | $0 | Tie |
| June | $71 | $89 | +$18 | HP |
| July | $108 | $135 | +$27 | HP |
| August | $99 | $124 | +$25 | HP |
| September | $43 | $53 | +$10 | HP |
| October | $101 | $86 | -$15 | Gas |
| November | $237 | $197 | -$40 | Gas |
| December | $380 | $315 | -$65 | Gas |
| Annual Total | $2,319 | $2,070 | +$-249 | HP |
Rates: Eversource MA residential $0.2836/kWh, National Grid gas ~$1.89/therm. 2,500 sq ft home, ~830 heating therms/year, standard insulation. Heat pump COP 3.5, SEER2 20. Gas furnace AFUE 96%, central AC SEER2 16.
This comparison includes equipment purchase, installation, annual maintenance, and fuel costs with a conservative 3% annual rate escalation for both electricity and gas.
Cold-climate, heating + cooling
96% AFUE furnace + SEER2 16 AC
After Mass Save rebates, the heat pump system costs roughly $8,000 net vs $12,000 for gas + AC. The heat pump is cheaper upfront and has lower operating costs. Even without rebates, the $6,000 upfront premium ($18,000 vs $12,000) is recovered in approximately -24 years through lower energy bills. With 3% annual rate escalation, gas costs rise faster in absolute dollar terms, widening the gap further each year.
A heat pump provides both heating and air conditioning from a single system. A gas furnace only heats -- you need a separate central AC unit ($4,000-6,000) for summer cooling. The heat pump eliminates this dual-system complexity.
Heat pumps with variable-speed compressors (inverter-driven) provide superior dehumidification in summer compared to single-stage central AC systems. Boston summers regularly hit 80%+ humidity, and mini-splits excel at moisture removal.
Heat pumps have no combustion, no carbon monoxide risk, no gas line, and no flame. Gas furnaces require CO detectors, annual combustion safety checks, and carry a small but real risk of gas leaks and carbon monoxide exposure.
During polar vortex events when Boston drops below 0F, heat pump capacity decreases 20-30%. A gas furnace delivers full output regardless of outdoor temperature. This is the main argument for keeping gas as backup (dual-fuel).
Heat pumps need filter cleaning/replacement and an annual check -- about $100/year. Gas furnaces require combustion analysis, heat exchanger inspection, and gas valve testing -- about $200/year. Both last 15-20 years with proper care.
A heat pump in Boston produces about 2.1 tons CO2/year based on the MA grid mix (increasingly renewable). A gas furnace produces about 6.5 tons CO2/year. As the grid gets cleaner, the heat pump advantage grows.
Mass Save remains the primary incentive for Boston homeowners switching from gas to heat pump. With no federal 25C credit available in 2026, these state-level rebates are the largest financial incentive for heat pump adoption.
Up to $10,000
For systems that fully displace gas heating. Includes weatherization bonuses when applicable.
Up to $8,500
For systems that partially displace gas. Dual-fuel setups qualify at reduced rates.
Enhanced rebates
Households at or below 80% AMI may qualify for higher rebate amounts and no-cost weatherization.
Important: The federal Section 25C energy efficiency tax credit expired December 31, 2025. There is no federal tax credit for heat pump installations in 2026. Mass Save rebates are the primary financial incentive available to Boston homeowners.
Heat pumps win the math for most Boston homeowners, but there are specific situations where sticking with gas is the more practical choice.
If your home has minimal insulation, single-pane windows, and major air leaks, a heat pump will struggle to keep up in deep winter without expensive weatherization first. Address insulation before switching.
If you are selling soon, the upfront investment may not pay back. Though heat pumps do add resale value, the ROI timeline is typically 5-8 years.
If you just installed a new 96%+ AFUE furnace in the last 2-3 years, replacing it makes little financial sense. Consider adding a heat pump for cooling and shoulder-season heating instead (dual-fuel).
If your home has a 100-amp panel and upgrading to 200-amp would cost $3,000-5,000, factor that into the total project cost. Some heat pump systems can work on 100-amp panels, but whole-home systems often need more capacity.
Yes. At Eversource's current rate of $0.2836/kWh, a cold-climate heat pump costs $1,100-1,400/year to heat a typical 2,500 sq ft Boston home. A gas furnace at National Grid's ~$1.89/therm rate costs $1,400-1,800/year. Heat pumps save 15-30% annually on heating and also provide air conditioning, eliminating the need for a separate cooling system.
Yes. Modern cold-climate heat pumps (ccASHP) from Mitsubishi, Daikin, and Fujitsu are rated to operate efficiently down to -13F. Boston's average winter low is around 22F, well within operating range. During extreme cold snaps below 5F, capacity drops 20-30%, but the system still operates. Some homeowners keep a gas furnace as backup for the coldest days (dual-fuel setup).
No. The federal Section 25C energy efficiency tax credit expired on December 31, 2025, under the OBBBA legislation signed July 4, 2025. There is no federal tax credit for heat pump installations in 2026. However, Mass Save rebates of up to $10,000 for whole-home heat pump systems remain available for Massachusetts homeowners.
Mass Save offers up to $10,000 in rebates for whole-home heat pump systems that displace fossil fuel heating in Massachusetts. Income-eligible households may qualify for even higher rebates. The rebate amount depends on system size, displacement level, and whether weatherization is done alongside the installation.
With Mass Save rebates reducing the upfront cost gap, a heat pump typically breaks even with a gas furnace + AC system in 5-8 years based on current Boston utility rates. With 3% annual rate escalation, the breakeven may come even sooner as gas prices tend to be more volatile than electricity prices.
A dual-fuel (hybrid) setup can make sense in Boston. The heat pump handles 90%+ of heating hours, and the gas furnace kicks in only during extreme cold below 0F. This costs less upfront than full heat pump replacement. However, you still pay National Grid gas connection fees ($10-15/month) year-round even when not using gas.
Get a personalized cost comparison based on your home size, current heating system, and utility rates. Free assessment, no obligation.