Across 327 permits filed since 2025-05-02, the median is $13,850; half of projects fall between $7,225 and $19,750. 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 New London County, CT actually reported when they pulled permits.
Recent filings
- Adding subpanel in garage, workbench outlets, electrical for mini split for bonus room upstairs, bonus room rough in electrical outlets and lighting, generator inlet boxGroton · 2026-10-30$5,000
- Upgrade underground electrical service from 100 amp to 200 Amp 120/240V. Wire new heat pump for 2nd floor bedroomGroton · 2026-10-27$14,000
- Furnish and install HVAC System for the Ace Overhead door projectGroton · 2026-10-26$40,000
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 New London County, CT came in between $7,225 and $19,750. 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