Across 124 permits filed since 2025-03-09, the median is $14,800; half of projects fall between $7,950 and $21,952. Figures are permit valuations reported to building departments. National cost guides answer this question with averages from other markets; these numbers are what homeowners in Middlesex County, CT actually reported when they pulled permits.
Recent filings
- *Reusing existing oil boiler, install a new hydro air heating and heat pump system for the 1st and 2nd floors.Town of Westbrook · 2026-09-03$48,000
- Replacement of A/C conderser and Air HandlerHigganum · 2026-08-28$5,800
- Install 100 amp sub panel powered by 200 amp panel. Wiring off mini split heat pump system. Install 2-50 amp receptacles/circuitsHigganum · 2026-08-26$4,000
How to read these numbers
Permit valuations are the project cost the applicant reports to the building department. They skew slightly low — nobody rounds up for the permit fee — and scope varies, so the middle-half range is the honest picture: half of all hvac / central air permits in Middlesex County, CT came in between $7,950 and $21,952. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
Same project, other places
HVAC / central air in New JerseyHVAC / central air in New YorkHVAC / central air in ConnecticutHVAC / central air on Long Island