Nassau & Suffolk.
Residential and commercial HVAC service across Long Island’s Nassau and Suffolk Counties.
Based in East Setauket.
Ready to help.
A1 provides heating, cooling and hot water repairs, maintenance and installations for properties across both counties.
Send us your service address and a short description of what you need. We’ll confirm coverage and coordinate the next step.
Check service availabilitySuffolk County
Local service from our East Setauket base for residential and commercial properties.
Nassau County
Heating, air conditioning, heat pumps, water heaters and commercial equipment.
Emergency service: 24/7
Call 631-331-2102 for urgent service.
HVAC help across our Long Island service area.
From our East Setauket base, we serve communities including Setauket, Stony Brook, Port Jefferson, Smithtown, Centereach, Lake Grove, Medford, Holtsville, Huntington, Commack, Northport, Islip and Bay Shore in Suffolk, plus Nassau communities including Massapequa and Lido Beach.
Other Suffolk communities we serve include Hauppauge, Babylon, Ronkonkoma, Holbrook, Selden, Patchogue, Miller Place, Mount Sinai, Rocky Point, Farmingville, Sayville, Oakdale, Bohemia and Kings Park.
We service gas and oil heating, central air, heat pumps, ductless mini-splits, water heaters and commercial rooftop equipment. Coverage and appointment availability are confirmed for your address.