- Home
- Cost Guides
- AC Replacement
- Boston, MA
HVAC · Boston, MA · 2026 cost guide
How much does AC replacement cost in Boston, MA?
In the Boston-Cambridge-Newton, MA-NH area, replacing a central air conditioner runs about $6,900 to $15,000 installed in 2026, about 25% above the national range. Contractor labor here is indexed at 1.25 against the U.S. average, and that is what moves the numbers; equipment and materials cost about the same everywhere.
- Central AC
- $6,900–$15,000condenser and coil, installed
- Heat pump
- $8,800–$20,000heats and cools, installed
- AC + furnace
- $11,300–$25,000full split system
- Ductless mini-split
- $5,000–$17,500one to four zones
Replacing an air conditioner in Boston is really a decision about heating. With about 5,600 heating degree days and only 800 cooling degree days, the outdoor unit that cools for ten weeks can also heat for six months if it is a cold-climate heat pump, and Mass Save rebates from Eversource and National Grid are built to push you that way. Most installs run $6,900 to $15,000 installed. Here is how sizing, the heat pump choice, rebates, and permits work in the Boston area.
What's different in Boston
Sizing in climate zone 5A runs both directions. A Boston home needs modest cooling capacity, so an AC-only system can be small, but a heat pump has to carry the heating load on a January night near zero, and a cold-climate model is sized to that number, not to the summer. Ask for a Manual J run with Boston design temperatures and look at the heating output at 5 degrees, not just the tonnage. Many older homes have no ducts at all, which is why ductless mini-splits and small-duct systems are a bigger share of the Boston market than anywhere in the Sun Belt.
The heat pump math is unusually good here. Electricity at Eversource and National Grid runs about $0.31 per kWh, which is expensive, but oil and gas boilers are old and inefficient in much of the housing stock, and Mass Save whole-home heat pump rebates run to five figures for a home that switches all of its heating. The Mass Save HEAT Loan offers zero-percent financing on qualifying equipment. Both require a no-cost home energy assessment first, so schedule that before you sign anything. A hybrid setup that keeps the boiler for the coldest days qualifies for smaller partial rebates.
Rules and timing are simple. The North region minimum for central AC is 13.4 SEER2, and a heat pump should carry a cold-climate rating with useful capacity at 5 degrees. Boston ISD or the town building department permits the mechanical and electrical work, and a licensed electrician handles the new circuit; a panel upgrade is common in older homes with 100-amp service. Installers are slowest from October through March, which is the cheapest time to buy, though a heat pump replacement in winter needs a plan for heat during the swap. Snow means the outdoor unit goes on a raised stand, not a ground pad.
AC Replacement prices in Boston vs. the national guide
These are the ranges from our national AC replacement cost guide next to the same items scaled by the Boston, MA labor index of 1.25. Rows marked fixed are materials only and do not move with local labor.
| Item | National range | Boston, MA |
|---|---|---|
| Central AC | $5,500–$12,000 | $6,900–$15,000 |
| Heat pump | $7,000–$16,000 | $8,800–$20,000 |
| AC + furnace | $9,000–$20,000 | $11,300–$25,000 |
| Ductless mini-split | $4,000–$14,000 | $5,000–$17,500 |
Local tip: Book the free Mass Save home energy assessment before you collect bids; in Boston the rebate and HEAT Loan often decide which system is cheapest to own.
Boston at a glance
- Climate zone
- 5Acold-humid
- Labor index
- 1.25vs. U.S. average 1.00
- Cooling degree days
- 800per year, base 65 °F
- Heating degree days
- 5,600per year, base 65 °F
- Min. AC efficiency
- 13.4 SEER2federal minimum for this region
Want a number for your Boston home instead of a metro range?
Answer six quick questions and get a cost range for your AC replacement project, then quotes from up to four licensed pros who work your ZIP. Free, and you can ignore the calls.
Get my HVAC estimate →AC Replacement cost questions in Boston, answered.
Should I replace my AC with a heat pump in Boston?
Probably, if your boiler or furnace is also aging. A cold-climate heat pump cools for the short summer and heats through a Boston winter, and Mass Save rebates from Eversource or National Grid are largest when it replaces all of your heating. If your boiler is new, a plain AC or a partial heat pump with the boiler as backup still qualifies for a smaller rebate. Start with the Mass Save home energy assessment.
How do Mass Save heat pump rebates work in Boston?
You book a no-cost home energy assessment through Mass Save, which Eversource and National Grid run, then use a participating installer. The largest rebate goes to whole-home systems that replace the boiler or furnace entirely, with smaller amounts for partial systems, and the zero-percent HEAT Loan can finance the rest. Amounts and rules change by year, so have the installer confirm the current program before you sign.
Do I need central AC in Boston, or is a mini-split enough?
For many homes a mini-split is the better fit. Boston summers are short at about 800 cooling degree days, and much of the housing stock has radiators and no ducts, so adding ductwork for central AC is expensive. Two or three ductless heads cool the rooms you use and, as heat pumps, cut boiler run time in the shoulder seasons. Central AC makes sense if you already have ducts from a furnace.
Why is my Boston AC install price higher than the national range?
Labor and the building. Boston trade wages run about a quarter above the national average, licensed electricians and gas fitters are required for their parts of the job, and older homes often need a panel upgrade, a raised stand for snow, or new line-set routing through plaster walls. A heat pump also costs more than a plain AC, though Mass Save rebates and the value of displaced oil or gas heat narrow that gap.
AC Replacement costs in nearby metros
AC Replacement cost in New York, NY
New York-Newark-Jersey City, NY-NJ. Labor index 1.35, climate zone 4A.
Read the New York guide → HVACAC Replacement cost in Baltimore, MD
Baltimore-Columbia-Towson, MD. Labor index 1.05, climate zone 4A.
Read the Baltimore guide → HVACAC Replacement cost in Washington, DC
Washington-Arlington-Alexandria, DC-VA-MD-WV. Labor index 1.10, climate zone 4A.
Read the Washington guide → HVACAC Replacement cost in Chicago, IL
Chicago-Naperville-Elgin, IL-IN-WI. Labor index 1.20, climate zone 5A.
Read the Chicago guide →