Arlington, next door, keeps new gas equipment out of major renovations; Medford doesn’t. That leaves you a real choice, and Clement Boston Heat Pumps builds every heat pump installation in Medford, MA around it: all-electric, or a heat pump with gas backup.
Over a quarter of Medford homes are two-families, where each floor may have its own furnace or boiler. The two floors don’t have to make the same choice.
All-electric or gas backup: deciding in Medford
The state named Medford a comparison community in its fossil-fuel-free program, so it reports permits for comparison but doesn’t restrict fuel. Both designs are open; the house decides.
| All-electric (whole-home) | Heat pump with gas backup (dual fuel) | |
|---|---|---|
| Old equipment | Removed or disconnected | Furnace stays for the coldest hours |
| Mass Save tier | Whole-home, the larger rebate | Partial-home, needs integrated controls |
| Best fit | Old furnace, good ducts, tight house | Newer furnace, larger heat loss |
| Gas bill | Ends, if nothing else uses gas | Small, winter only |
When dual fuel makes sense
A furnace that’s only a few years old still has a long life ahead. Keeping it as backup, with controls that hand off to gas below a set outdoor temperature, lets the heat pump carry most of the season. See dual fuel heat pumps.
When all-electric wins
A furnace near the end of its life is the natural moment to go all-electric, and the whole-home rebate pays more. We size the heat pump to hold the house at design temperature without leaning on strips; see whole-home heat pumps.
The specialized code
Medford adopted the specialized stretch code on July 1, 2024. It steers new homes and major renovations toward all-electric or pre-wired designs but still allows mixed-fuel paths; a straight replacement is unaffected.
Two-families, floor by floor
Medford’s housing is about 34% detached and 27% two-family, with nearly half built before 1940. When a two-family has two furnaces of different ages, a split decision can make sense.
The first floor
The basement furnace and its ducts serve the first floor. If the furnace is newer, a heat pump coil and outdoor unit pair with it as a dual-fuel system, and the ducts stay.
The second floor
The upstairs unit’s furnace may sit in the attic, or the floor may run on a boiler. An attic air handler heat pump replaces it outright, with short insulated branches through the ceilings.
Two units, two decisions
Each floor has its own thermostat, its own circuits and its own rebate paperwork. One owner can go all-electric while the other keeps gas. The thermostat guide explains how dual-fuel controls choose between the two.
Single-family houses and three-deckers
The rest of Medford’s stock runs from colonials in West Medford and Lawrence Estates to a smaller number of three-deckers near Medford Square and South Medford.
Colonials with partial ducts
A colonial whose basement furnace feeds the first floor well and the bedrooms poorly gets two zones: the downstairs ducts stay, and an attic unit takes the second floor. See furnace to heat pump.
Three-deckers
About 7% of Medford homes sit in three- or four-unit buildings. Each floor gets its own system; the three-decker guide covers the middle floor.
Two outdoor units on one lot
A two-family with a system per floor needs two outdoor units, and Medford lots are rarely wide. Where they go is worth settling before the equipment is chosen.
Spacing and sound
Medford’s own setback or sound limit for outdoor units is confirmed per address. The state noise policy treats a source more than 10 dB(A) above background as a problem, so we compare each unit’s rated sound with the distance to the nearest neighbor’s window and keep the pair apart rather than side by side.
Height and access
Each unit sits on a stand above the drift line, with clear space for airflow and for service. Line sets run along the foundation to each floor’s air handler, one up the side wall to the attic and one into the basement. Our snow stand guide covers clearances.
Sizing for the right night
Medford sits a little inland of Boston, between the harbor and the Fells. Each floor’s load is calculated room by room at the local design temperature, and equipment is chosen by its output at 5°F rather than its rated size.
Fuel, rates and running cost
Gas heats about 62% of Medford homes, electricity about 19% and oil about 15%. National Grid supplies both electricity and gas, so it sponsors the Mass Save rebate whichever fuel you leave.
Oil homes
Oil costs more per unit of heat than a heat pump on National Grid’s winter rate. Those homes have the clearest running-cost case; see oil to heat pump.
Gas homes
Gas costs less per unit of heat than a heat pump on National Grid’s rate, which is why dual fuel suits some Medford houses. The gas furnace guide works through the numbers, and the backup heat guide explains the switchover point.
Code and rebate rules that apply in Medford
Medford’s Building Department takes applications through its online CitizenServe portal: electrical and sheet metal for a ducted job, gas where a line is capped or a furnace stays.
| What | The Medford picture |
|---|---|
| Permit portal | CitizenServe |
| Energy code | Specialized stretch code since July 1, 2024 |
| Fossil-fuel-free program | Comparison community; gas backup allowed |
| Electric and gas utility | National Grid |
| Built before 1940 | 48.8% |
National Grid’s seasonal rate lowers winter distribution charges for homes that heat with a heat pump. Our rebate guide lists the whole-home and partial-home conditions.
How the work runs on a Medford job
The visit works floor by floor: heat loss room by room, the age and condition of each furnace or boiler, the ducts, the panel, and a spot for each outdoor unit.
- Two options on paper where it’s close: an all-electric price and a dual-fuel price, each with its rebate tier.
- Permits through CitizenServe, then three to seven working days on site per floor.
- Controls set so a dual-fuel floor hands off to gas at the temperature in the estimate.
- Commissioning: pressure test, vacuum, refrigerant by weight, airflow and static measured, lockout recorded.
Somerville and Malden border Medford to the south and east; Arlington to the west runs the fossil-fuel-free by-law.