Expert HVAC care.
Comfort you can
count on.
Repairs, maintenance and installations for central air, mini-splits, furnaces, boilers, water heaters and commercial systems.
Every season.
Every kind of comfort.
From oil and gas heating to modern heat pumps, A1 takes care of the equipment your property depends on.
REPAIRS · MAINTENANCE · REPLACEMENTS · INSTALLATIONSAir Conditioning
- Central air systems
- Condensers & air handlers
- Packaged cooling units
- All equipment makes & models
Heating
- Gas & oil furnaces
- Gas & oil hot-water boilers
- Oil burners: Beckett, Carlin & Riello
- Hydronic heating & hydro-air
Heat Pumps & Mini-Splits
- Ducted heat pumps
- Ductless mini-splits
- Single-zone & multi-zone systems
- Indoor units & outdoor condensers
Water Heaters
- Electric, gas & oil water heaters
- Heat-pump water heaters
- Indirect hot-water tanks
- Tankless water heaters
Commercial HVAC
- Rooftop units (RTUs)
- Commercial packaged units
- Heating & air conditioning systems
- Equipment installations & replacements
Indoor Air Quality
- Air filters & filtration systems
- UV-C air treatment
- Humidifiers & dehumidifiers
- Thermostats & comfort controls
Real work.
Local people.
A1 attention to detail.
Clear explanations, careful work and a team you can reach when your system needs attention.
- Service for all equipment makes and models
- Oil, gas, electric and heat-pump systems
- Residential and commercial properties
Project photos from A1’s Google Business Profile.
Care for your systems.
Plan for the seasons.
Ask about seasonal tune-ups, covered equipment and ongoing service benefits. Our office will explain the options and provide your quote directly.
Compare service agreementsClear steps. Personal service.
We make it easier to understand what your system needs and what happens next.
Tell us about your system.
Share the symptoms, equipment type and service address. For urgent help, call us directly.
Understand your options.
We review the problem and explain repair, maintenance or replacement options.
Let’s get the work done.
We coordinate the visit, complete the agreed work and explain the next steps for system care.
CLIENT HUB
Your service, all in one place.
Review quotes, check appointment details, view invoices and request more work through your secure Jobber Client Hub.
Use the email you have on file with A1.
Based in Setauket.
Here for Nassau & Suffolk.
Heating, air conditioning and hot water service for homes, businesses and commercial properties across both counties.
Explore our service area →Suffolk County
Local service from our East Setauket base.
Nassau County
Residential and commercial HVAC support.
Call 631-331-2102 to confirm service for your address.
Know what to expect.
Do you offer 24/7 emergency service?
Yes. A1 provides 24/7 emergency service for heating, air conditioning and hot-water problems. Call 631-331-2102 for urgent help.
Do you service oil and gas heating?
Yes. We repair, maintain and install gas and oil furnaces, gas and oil hot-water boilers, hydronic heating and hydro-air systems.
Which air conditioning systems do you work on?
Central air, condensers, air handlers, packaged units, ductless mini-splits and ducted heat pumps. We service all makes and models.
What types of water heaters do you service?
Electric, gas, oil, heat-pump, indirect and tankless water heaters. We handle repairs, maintenance, replacement and installation.
Do you service commercial HVAC and rooftop units?
Yes. A1 provides commercial heating and cooling service, including rooftop units (RTUs), packaged equipment and system installations.
Where can I see my quotes and appointments?
Use Client Login to open A1’s Jobber Client Hub. Enter the email you have on file with A1 to receive your secure login link.