Across 94 permits filed since 2025-03-10, the median is $12,000; half of projects fall between $8,000 and $18,140. 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 Litchfield County, CT actually reported when they pulled permits.
Recent filings
- replacement mini split install, direct swap out of existing unit.Town of Watertown · 2026-09-01$14,186
- Remove and replace the existing furnace and air conditioning equipment in the exact same location and footprint as original with new Rheem brand ROCB118V05 furnace and new Daikin brand DC4SEA4210 condenser and controls.Town of Watertown · 2026-08-27$20,000
- Furnish and install a Mitsubishi MXZ-5D24NL, 42,000 BTU, R-454B, 19 SEER heat pump condenser set on a stand, a MSZ-GX12NL indoor unit mounted on the outside wall dining room wall, a MSZ-GX12NL indoor unit on the outside wall of the downstaiTown of Watertown · 2026-08-25$17,960
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 Litchfield County, CT came in between $8,000 and $18,140. 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