Central air conditioner replacement cost in Boston, MA
Installed, 3 ton (outdoor unit + matching coil)
A typical central AC (3 ton (outdoor unit + matching coil)) costs about $4,950 installed in the Boston area, 6% above the national figure, because HVAC technicians here earn a median $38 an hour against $29 nationally.
Prices by size in Boston
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| 2 ton (outdoor unit + matching coil) | $3,300 | $3,700 | $4,850 | $3,500 |
| 3 ton (outdoor unit + matching coil) | $4,300 | $4,950 | $6,550 | $4,650 |
| 4 ton (outdoor unit + matching coil) | $5,750 | $6,400 | $8,400 | $6,000 |
| 5 ton (outdoor unit + matching coil) | $7,100 | $8,000 | $9,900 | $7,400 |
Local labor: what HVAC technicians earn here
| Hourly wage | Boston metro | United States |
|---|---|---|
| 25th percentile | $30 | $23 |
| Median | $38 | $29 |
| 75th percentile | $47 | $37 |
The Boston market
Boston's Inspectional Services Department requires a plumbing permit to replace or install a water heater or boiler when no other work, such as opening walls, is involved. These permits are available to licensed contractors only: a homeowner must hire someone with a valid Massachusetts trade license to apply and do the work. The fee is a $20 application fee plus $5 per fixture, though the city does not say whether a water heater counts as one fixture. After the job, the contractor schedules an inspection through the ISD call center and must be on site for it. City pages checked do not cover furnace, central AC or heat pump replacement, or a separate gas permit for gas heaters, so check with ISD. Older housing shows in the data: EIA found 26% of Massachusetts homes heat with a boiler and 15% heat water with fuel oil. Cambridge, Newton and New Hampshire towns have their own departments.
Central air is less common in this region. EIA found it in 32% of Massachusetts homes, with 58% relying on room units. Many older Boston homes lack ducts, so adding central AC can require new ductwork in attics or closets. Room-unit households often compare central AC against ductless heat pumps. Ask where the condenser will sit, since many lots in older neighborhoods are small and close to the neighbors' windows.
Permits in Boston
| Permit for this job | Boiler: yes (plumbing permit); furnace/central AC/heat pump: unclear |
|---|---|
| Fee | $20 application fee plus $5 per fixture (plumbing permit) |
| Who can pull it | Massachusetts-licensed contractor only; homeowners must hire one |
| Inspection | Yes |
Rebates in Massachusetts
HEAR: status unclear. HOMES: status unclear. Source: Massachusetts Department of Energy Resources (DOER), checked October 13, 2026.
- Mass Save: Utility collaborative: heat pump (air-source, ground-source) rebates, 0% HEAT Loan, income-based enhanced offers
- Mass Save/state interest-free home energy loans: Interest-free loans 'up to $25,000 for insulation, heat pumps and related improvements' (announced 2026-09-03)
What these programs cover, and other states
Other systems in Boston
- Gas tank water heater
- Gas tankless water heater
- Gas furnace
- Heat pump (ducted, outdoor unit + air handler)
Central air conditioner cost in other metros
Sources
- City of Boston: Install or replace a water heater or boiler
- City of Boston: Plumbing permit
- Mass Save: residential programs
- Mass.gov: interest-free loans for home energy upgrades (Sept 2026)
- EIA, 2020 RECS: Highlights for space heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for water heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for air conditioning in U.S. homes by state
- https://www.boston.gov/boston-permitting/install-or-replace
- BLS OEWS May 2025, Boston-Cambridge-Newton, MA-NH (49-9021 HVAC mechanics and installers)
- DOE Residential CAC & Heat Pumps Direct Final Rule TSD (Dec 2016), Table 8.2.30, split AC coil-only (2015$; 4-ton interpolated)