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Honest answer: at Eversource's $0.36/kWh all-in rate, a cold-climate heat pump costs about $2,937/year to heat and cool a typical Boston home — roughly $751 more than an efficient 96% AFUE gas furnace plus central AC (~$2,186/year at National Grid's ~$1.89/therm). Boston's high electric rates mean the heat pump doesn't beat efficient gas on the monthly bill. Where it wins: Mass Save rebates (up to $8,500), one system for heating and AC, no combustion, lower carbon, and a clear edge over oil, propane, and electric baseboard.
$2,937
Heat Pump Annual
Heating + Cooling
$2,186
Gas + AC Annual
Heating + Cooling
$751
Gas Runs Cheaper By
Operating cost / year
Up to $8,500
Mass Save Rebate
Closes the gap
This table shows month-by-month energy costs for a typical 2,500 sq ft Boston home at the live Eversource all-in bundled rate ($0.36/kWh). 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. Read it honestly: efficient gas wins every heating month, the heat pump wins the cooling months on its higher SEER2, and the gas system comes out ahead on annual operating cost — because Boston's electric rate is high.
| Month | Heat Pump | Gas + AC | Savings | Winner |
|---|---|---|---|---|
| January | $541 | $354 | -$187 | Gas |
| February | $466 | $305 | -$161 | Gas |
| March | $361 | $236 | -$125 | Gas |
| April | $180 | $118 | -$62 | Gas |
| May | $74 | $66 | -$8 | Gas |
| June | $90 | $112 | +$22 | HP |
| July | $136 | $171 | +$35 | HP |
| August | $126 | $157 | +$31 | HP |
| September | $54 | $67 | +$13 | HP |
| October | $127 | $88 | -$39 | Gas |
| November | $301 | $197 | -$104 | Gas |
| December | $481 | $315 | -$166 | Gas |
| Annual Total | $2,937 | $2,186 | -$751 | Gas |
Rates: Eversource MA residential $0.36/kWh (all-in bundled, live from our canonical rate database), 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 compares operating cost only; equipment, rebates, and the avoided AC purchase are covered in the total-cost section below.
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 a Mass Save rebate of up to $8,500, the heat pump system costs roughly $9,500 net versus $12,000 for a new gas furnace plus central AC — so the heat pump is about $2,500 cheaper to install, because it is one system instead of two. The flip side: at Eversource's $0.36/kWh all-in rate, the heat pump costs about $751/year more to run than the efficient gas system. Over a 10-year horizon with 3% annual escalation, that operating gap adds up — gas comes out roughly $13,609 cheaper on total cost of ownership ($52,669 for the heat pump vs $39,060 for gas + AC). So the heat pump is not the cheaper choice on pure dollars against efficient gas in Boston today. You choose it for the lower install, the single heat-and-cool system, no on-site combustion, lower carbon, and protection from fossil-fuel price swings — and it remains a clear money-saver against oil, propane, or electric-resistance heat.
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 $8,500
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.
At Boston's high electric rates, an efficient gas furnace already holds its own on operating cost — and in these specific situations, sticking with gas (or going dual-fuel) is the more practical choice rather than a full heat pump conversion.
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.
Not on the monthly bill — at least not against an efficient gas furnace. At Eversource's all-in bundled rate of $0.36/kWh, a cold-climate heat pump costs about $2,937/year to heat and cool a typical 2,500 sq ft Boston home. A 96% AFUE gas furnace at National Grid's ~$1.89/therm, plus central AC, runs about $2,186/year — roughly $751 less. Boston's high electric rates flip the usual "heat pumps always win" story. The heat pump's real advantages are different: Mass Save rebates (up to $8,500), one system that both heats and cools (no separate $4,000-6,000 AC), no on-site combustion or carbon-monoxide risk, lower carbon, and a decisive win over oil, propane, and electric-resistance heat. Pair it with solar and net metering and its running cost can drop toward zero.
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 $8,500 for whole-home heat pump systems remain available for Massachusetts homeowners.
Mass Save offers up to $8,500 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.
Because the monthly bill is only one line in the comparison. A heat pump replaces both your furnace AND your central AC with a single system, so against a "gas furnace + new central AC" project the up-front gap narrows sharply — especially after Mass Save rebates of up to $8,500. You also gain ConnectedSolutions demand-response payments, no combustion or carbon-monoxide risk, far lower carbon, and protection from volatile fossil-fuel prices. The pure operating-cost gap versus efficient gas is roughly $751/year — small enough that rebates, the avoided AC purchase, and solar pairing routinely outweigh it. Against oil, propane, or electric baseboard, the heat pump wins on running cost too.
A dual-fuel (hybrid) setup can make sense in Boston, and at today's high electric rates it is more attractive than ever. The heat pump handles the milder shoulder-season and most winter hours; the gas furnace takes over on the coldest days when both the heat pump's efficiency and Boston's electric rate make gas the cheaper fuel. 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.
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