Across 491 permits filed since 2025-03-10, the median is $15,709; half of projects fall between $10,000 and $25,000. 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 Nassau County, NY actually reported when they pulled permits.
Recent filings
- Residential Air Conditioning - Installation of central heat pump systemVillage of Garden City · 2026-09-08$15,000
- TWO (2) NEW A/C UNITS IN FRONT YARD WITH REQUIRED LANDSCAPING IN ACCORDANCE WITH NYS AND RVC CODESRockville Centre · 2026-09-04$25,000
- Residential Air Conditioning - Installation of one ductless heat pump system to include six (6) wall mounted mini split heads and three (3) condensersVillage of Garden City · 2026-09-04$15,000
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 Nassau County, NY came in between $10,000 and $25,000. 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