Serving Suffolk & Nassau County · Long Island, NY
Mount Sinai, Suffolk County
Dependable heating and air conditioning repair, installation, and emergency service for Mount Sinai homeowners. Licensed, insured, and serving Suffolk County since 2019.
What we offer in Mount Sinai
Serving Mount Sinai since 2019
A1 Heating & Air Conditioning has been serving Mount Sinai and the surrounding Suffolk County area since 2019. As a family-owned business, we understand the unique heating and cooling needs of Long Island homes — from older oil-heated colonials to newer construction with central air.
We also serve nearby Miller Place, Port Jefferson, Stony Brook, and Rocky Point — so wherever you are in the area, we're close by.
Common questions
Yes — A1 Heating & Air Conditioning serves Mount Sinai and surrounding communities including Miller Place, Port Jefferson, Stony Brook, and East Setauket. Call 631-331-2102 to schedule service.
Absolutely. We repair and replace gas furnaces, oil furnaces, and boilers throughout Mount Sinai. We offer same-day and emergency heating service — call 631-331-2102 any time.
Yes. We install central AC systems and ductless mini-splits throughout Mount Sinai. We'll assess your home and recommend the most efficient and cost-effective cooling solution.
We offer 24/7 emergency HVAC service and aim to respond to Mount Sinai calls as quickly as possible. Don't wait if your heat or AC has stopped working — call 631-331-2102 right away.
Yes. Our Platinum Membership includes annual heating and cooling tune-ups, priority scheduling, and discounts on repairs. It's the best way to keep your system running efficiently year-round.
Our Services
Nearby Service Areas
Get in Touch
Serving Mount Sinai and all of Suffolk County. Same-day and emergency service available.
631-331-2102Serving Mount Sinai & surrounding areas
Same-day and emergency service available. Licensed, insured, and trusted by Mount Sinai homeowners since 2019.