Across 399 permits filed since 2025-03-08, the median is $50,000; half of projects fall between $16,000 and $387,338. 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 Greenwich, CT actually reported when they pulled permits.
Recent filings
- New SFR w/attached 3 car garage. PLU: IN SLAB OR UNDERGROUND WORK ONLY (as permit is currently a Foundation Only permit: apply for fixtures or other work when becomes full building permit). Amendment (8/27/26): Make full plumbing for basemeTown of Greenwich · 2026-09-03$1,200,000
- install power wiring for hvac ductless split system on roof (electrical for Hvac is permit 26-0113)Town of Greenwich · 2026-09-02$2,500
- install 1 water-to-water heat pump, indoor equipment onlyTown of Greenwich · 2026-09-01$2,722
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 Greenwich, CT came in between $16,000 and $387,338. 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