Serving Suffolk & Nassau County · Long Island, NY
Trusted HVAC Service
for Long Island Homes.
Licensed, insured, and family-owned since 2019. Honest, professional heating and cooling service — done right the first time.
What we do
Complete HVAC Services for Long Island
From routine maintenance to full system replacements — we handle it all with the same level of care and professionalism.
Why homeowners choose us
Professional Service You Can Actually Trust
We've been serving Long Island homeowners since 2019. Our reputation is built on honest work, fair pricing, and showing up when we say we will.
What Long Island Homeowners Say
Derrick Cherry
July 31, 2026
Great work and more importantly good people who came by and serviced my hvac system. I would recommend them to everyone who needs there expertis
Wendy Fade
July 30, 2026
We used them for our furnace two years ago and recently for our new central air unit. The entire team was helpful, pleasant and easy to work with. I would highly recommend this company.
Christopher Kady
July 21, 2026
I can't say enough great things about this team! They are professional, knowledgeable, reliable, and, most importantly, honest. After several other companies were unable to fix my ductless air conditioner, they quickly diagnosed the problem and got it working perfectly. It's hard to find a company you can truly trust, and they exceeded all of my expectations.
Albert Procida
July 16, 2026
Literally service with a smile. Ed was excellent, informative, and neat as a pin. Highly recommend.
Rommel Thielman
July 15, 2026
Did not know where to turn, so I Googled for a highly rated air conditioning service. The telephone receptionist was very pleasant and said she could get me someone within hours. Two men arrived, very courteous — Jakob and Christian. Within minutes they solved and repaired the problem. They also explained everything clearly. I was very pleased and would recommend A1 Heating and Air.
Joshua Gray
July 10, 2026
They came so quickly it was unbelievable, and same day. They quickly fixed the problem with our central AC. I would recommend!
Comfort Club
Protect Your System. Save Every Year.
Join the A1 Comfort Club and enjoy priority service, annual tune-ups, and exclusive discounts — all for one low annual rate.
- Annual tune-up for each covered unit
- Two (2) inspection visits per term
- Priority scheduling over non-members
- 24-hour service response guarantee
- Annual tune-up for each covered unit
- Two (2) inspection visits per term
- No diagnostic fees
- Front-of-line emergency priority
- Preferred scheduling windows
- 24-hour service response guarantee
Questions about membership? Contact us — we're happy to help you choose the right plan.
Customer stories
Real Homeowners.
Real Results.
"Our furnace died on the coldest night of the year. A1 had a technician at our door within two hours and a brand-new system installed the very next morning. The crew was professional, clean, and explained everything. We've been warm ever since."
"We got three quotes for a new central AC system and A1 came in with the best price and the most thorough explanation of what we actually needed. Installation was done in one day. Our house has never been this cool and comfortable in the summer."
"Called at 9pm on a Saturday when our AC stopped working during a heat wave. The technician arrived by 11pm, diagnosed a failed capacitor, and had us back up and running before midnight. Unbelievable service. This is the only HVAC company we will ever call."
"A1 has been maintaining our boiler for three years now. They always show up on time, explain what they find, and never try to upsell us on things we don't need. Honest, reliable, and genuinely good people. Highly recommend to anyone on Long Island."
"Had a ductless mini-split installed in our addition and the process was seamless from start to finish. The technician walked us through every option, the installation was neat and professional, and the system works perfectly. Couldn't be happier."
"Signed up for the maintenance plan two years ago and it has already paid for itself. They caught a cracked heat exchanger during a routine inspection — something that could have been a serious safety issue. Worth every penny for the peace of mind alone."
Authorized dealer & service provider for leading brands
Service Area
Serving All of Long Island
A1 Heating & Air Conditioning provides HVAC service throughout Suffolk County. Click your town to learn more.
Common questions
Frequently Asked Questions
Everything you need to know about HVAC service on Long Island.
What HVAC services does A1 offer on Long Island?
A1 provides a full range of HVAC services including AC repair, AC installation, AC maintenance, furnace repair, boiler repair, heating installation, ductless mini-splits, heat pump installation and repair, water heaters, whole-home air purifiers, humidifiers, commercial HVAC, and generator installation — all across Suffolk County and Nassau County.
Does A1 offer 24/7 emergency HVAC service?
Yes. We offer 24/7 emergency HVAC service throughout Long Island. Whether your AC stops working on the hottest day of summer or your furnace fails on a winter night, call 631-331-2102 any time and we'll respond as quickly as possible.
What towns on Long Island does A1 serve?
A1 serves all of Suffolk County including Smithtown, Huntington, Babylon, Commack, Hauppauge, Port Jefferson, Stony Brook, Islip, Bay Shore, Ronkonkoma, Patchogue, Centereach, Holbrook, Selden, Medford, Northport, Kings Park, Sayville, Oakdale, Bohemia, Farmingville, Miller Place, Mount Sinai, Rocky Point, Lake Grove, Holtsville, and East Setauket.
Is A1 Heating & Air Conditioning licensed and insured in New York?
Yes. A1 is fully licensed and insured in New York State. Our technicians are NATE-certified and factory-trained on all major HVAC brands including Lennox, Carrier, Trane, Rheem, Navien, Mitsubishi, and more.
How much does HVAC service cost on Long Island?
Costs vary depending on the type of repair or installation. A1 provides upfront, transparent pricing after diagnosis — no surprises. We also offer flexible financing options including 0% interest promotional financing on qualifying new system installations.
Does A1 offer HVAC maintenance plans?
Yes. Our Platinum Membership includes annual AC and heating tune-ups, priority scheduling, and discounts on repairs. Regular preventive maintenance extends system life, improves efficiency, and helps avoid unexpected breakdowns.
How long has A1 been in business?
A1 Heating & Air Conditioning has been serving Long Island homeowners since 2019. We are a family-owned and operated business committed to honest, reliable HVAC service throughout Suffolk County.
What HVAC brands does A1 install and service?
We install and service all major brands including Lennox, Carrier, Trane, Rheem, Navien, Generac, Mitsubishi, and Honeywell. We are an authorized dealer for leading manufacturers and can service virtually any make or model.
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Schedule Service Today.
Same-Day Appointments Available.
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