Gas heats about half of Massachusetts homes and more than half of Boston’s, so the heat pump vs gas furnace Massachusetts decision is the one most local households face.
Clement Boston Heat Pumps installs heat pumps that replace a furnace outright, and heat pumps that work alongside one. Which fits depends less on the fuel bill than on everything around it.
The short comparison
A gas furnace is the cheaper heat per unit; a heat pump heats and cools from one system, earns a rebate and removes combustion from the house.
| High-efficiency gas furnace (with central AC) | Cold-climate ducted heat pump | |
|---|---|---|
| Heat delivered per million BTU (derived) | About $25 | About $33 on Eversource’s winter rate; about $42 on National Grid’s |
| Cooling | A separate AC on the same ducts | Built in |
| Rebate for the switch | None for a new furnace | Mass Save whole-home rebate through the gas sponsor |
| Combustion in the house | Yes: venting, carbon monoxide risk, gas service | None |
| Town rules on new equipment | Restricted in some towns’ major renovations | Allowed everywhere |
| Cold-night output | Full output at any temperature | Lower in deep cold; sized for the design night |
Where the running-cost figures come from
The comparison converts both fuels to dollars per million BTU of heat delivered. It uses published prices and assumed efficiencies, so it shows the order, not your bill.
The derivation
- Gas: EIA’s Massachusetts residential average of $25.06 per thousand cubic feet is $24.19 per million BTU of fuel. A 95% furnace delivers that heat for about $25.
- Heat pump on Eversource’s winter rate: $82.90 per million BTU at COP 1, about $33 at a seasonal COP of 2.5.
- Heat pump on National Grid’s winter rate: $104.67 at COP 1, about $42 at COP 2.5.
To match gas on running cost, a heat pump would need a seasonal COP of about 3.3 on Eversource and 4.1 on National Grid. That’s above what a ducted system averages through a Boston winter. Our electric rate guide explains why the two utilities differ.
When a heat pump makes sense anyway
The running-cost gap is real but modest, and several common situations outweigh it.
Your central AC is failing
A heat pump is an air conditioner that also heats. If the AC needs replacing, a heat pump on the same ducts costs only modestly more and adds heat; see replace AC with a heat pump and heat pump vs central AC.
The furnace is near the end
Two old machines failing in the same few years is the natural point to replace both with one. The whole-home rebate is $2,650 a ton up to $8,500 for systems installed through 2026, stepping down from January 1, 2027.
Your town restricts new fossil equipment
Arlington, Brookline, Cambridge, Concord, Lexington and Newton are in the state’s fossil-fuel-free demonstration program. New buildings and major renovations there can’t add new fossil equipment, so a renovation can rule out a new furnace.
What daily life feels like with each
Both systems heat through the same registers, so the house looks the same. The difference is how the heat arrives and what else comes with the equipment.
Comfort and air
A furnace runs short, hot cycles and shuts off; a heat pump runs longer at lower output, so rooms swing less. In summer the heat pump is the air conditioner, and a variable-speed unit pulls more moisture out on muggy days.
Safety and upkeep
A furnace burns fuel indoors, so it needs a sound vent, a working carbon monoxide alarm and a yearly combustion check. A heat pump has no flame and no flue. It does need filters, a clear outdoor coil and a working condensate drain, all year round because it also cools.
The middle path: dual fuel
A dual fuel heat pump keeps the gas furnace and adds a heat pump on the same ducts. An integrated control runs the heat pump most of the winter and hands off to the furnace on the coldest hours.
- Rebate: Mass Save’s partial-home tier, $1,125 a ton up to $8,500 for systems installed through 2026
- Running cost: the control can favor whichever is cheaper at each outdoor temperature
- Trade-off: you keep the gas service, the venting and the yearly furnace check
Dual fuel isn’t available for a major renovation in the fossil-fuel-free towns. In Medford, Watertown and Bedford, which aren’t in that program, it remains an option.
What the switch involves
A gas furnace house usually has ducts that a heat pump can reuse, which keeps the job simpler than a boiler conversion.
- A load calculation at your town’s design temperature; furnaces are often oversized, so the heat pump frequently comes in smaller.
- Duct checks: static pressure, return size and leakage, because a heat pump moves more air.
- The panel: new 240-volt circuits, sometimes a service upgrade.
- The furnace out, and the gas line capped by a licensed gas fitter.
Our typical range for a whole-home heat pump on ducts we can reuse is $15,000 to $28,000 and up before rebates. The gas furnace conversion page covers the job in detail.
How we help you decide
At the first visit we price the options you’re weighing on one written estimate: whole-home, dual fuel, or a heat pump replacing only the AC. Each line shows the equipment, the duct work, the electrical, the rebate path and the price.
Bring a year of gas and electric bills and we’ll set the running-cost comparison next to it. Call us or send the form to book the visit.