Across 217 permits filed since 2025-01-28, the median is $10,945; half of projects fall between $6,751 and $15,498. 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
- Replace existing gas furnace with new, Ecoer, 40,000 BTU, 2-stage, natural gas-fired furnace in same location as existing.Montville · 2026-07-24$9,600
- Replacement of existing AC Condenser and coil with same, new Lennox AC Condenser and Coil to existing furnace no change to outdoor unit locationTown of Waterford · 2026-07-23$12,000
- Direct replacement of Oil Furnace,. AC Condenser and Air Handler with Trane Condenser 5TTR3042A1000Cand Air Handler 5TEM4B04AC31SA and Granby Oil Furnace KHM-100 going in existing locations.Montville · 2026-07-22$20,926
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 boiler / water heater permits in New London County, CT came in between $6,751 and $15,498. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
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