Across 148 permits filed since 2025-04-27, the median is $14,800; half of projects fall between $7,475 and $21,391. 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
- New HVAC forced hot air system for new houseHigganum · 2026-10-23$6,400
- New HVAC Equipment for new additionHigganum · 2026-10-21$6,000
- *Replacement of existing HWH with new Rheem Electric 40 gallon HWH no change to location, we will be replacing with a new 40 gallon heat pump HWHTown of Westbrook · 2026-10-19$4,500
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 $7,475 and $21,391. 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