Across 535 permits filed since 2025-05-01, the median is $16,000; 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 on Long Island actually reported when they pulled permits.
Recent filings
- HVAC 5 TONRockville Centre · 2026-10-29$19,000
- Mechanical Residential HVAC - Install two (2) zones of HVACVillage of Garden City · 2026-10-29$23,000
- 47 sq. ft. first floor rear, and 2,003 sq. ft. second floor addition, with a 110 sq. ft. front porch, with the installation of 2 A/C units in the side yard (demolish existing 885 sq. ft. ½ Story)Village of Garden City · 2026-10-29$400,000
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 on Long Island 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 Connecticut