Across 320 permits filed since 2025-04-30, the median is $16,000; half of projects fall between $8,000 and $31,000. 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 Norwalk, CT actually reported when they pulled permits.
Recent filings
- Replace gas supply pipe to four rooftop HVAC units to four separate gas metersCity of Norwalk · 2026-10-28$3,500
- Installation of HVAC equipment for 761 Main Ave in accordance with plans and specs. Installations of roof top units, heat pump split systems, gravity hood, exhaust fans, ceiling fans, electric unit heaters, registers, grilles, diffusers & mCity of Norwalk · 2026-10-26$1,668,800
- Remove oil furnace and AC, replace with Thermpride oil furnace, evap. coil and Midea outdoor heat pump, replace oil water heater with new Bock oil water heater 32ECity of Norwalk · 2026-10-26$14,000
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 Norwalk, CT came in between $8,000 and $31,000. 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