HVAC companies in St James, NY 11780
2 HVAC companies, with local market data for this ZIP.
General contractors 27Concrete and masonry 4Electricians 3HVAC 2Remodeling 1Fences and decks 1Excavation and demolition 1Other construction trades 1Roofing and exteriors 1Carpentry, drywall and windows 1
Area profitability, HVAC68 / 100Strong market, balanced field
Typical home value$855,000+8.2% in the past year
New homes permitted, 20251,399Suffolk County
Homeowners87.4%5,576 households
Source: Zillow (home value and housing demand in the score), data through Sep 2026. Permits and households: U.S. Census Bureau.
DML and S Air Conditioning and HeatingHVAC contractor · 6 Floral Ln, St James(631) 862-6016 · dmlsair.com
IslandaireHVAC contractor · 500 Middle Country Rd, Saint James(631) 471-2900 · islandaire.com · 4 drivers, 5 trucks
HVAC in ZIP 11780 at a glance
Local building angle: Suffolk County permitted 1,399 new homes in 2025, including 287 apartment units. 9% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.