We install the best
and fix the rest.
Since 1968, Weber & Grahn has earned a reputation for excellence in designing, installing, and repairing heating and air conditioning systems, and so much more. From indoor pool dehumidification systems to creating exceptional systems that integrate with the most complex architectural designs; we are a complete design and install company. Weber & Grahn proudly services throughout the east end of Long Island such as Southampton, East Hampton, Riverhead, Smithtown, and many more areas.
Weber & Grahn’s Mission
Our philosophy is pretty straightforward. When creating a comfortable indoor environment for your family, Weber & Grahn will do so with the highest possible level of precision, professionalism, and integrity. Whether we’re handling the design and installation of an HVAC system for new construction, installing a wine system to please the most discerning connoisseur or repairing an existing system that someone else installed, we approach the job at the highest level because our reputation depends on it. After all, our success is measured by your satisfaction.
Our Services Include
(BUT ARE NOT LIMITED TO):
- Total Home A/C & Heating System Design, Engineering & Installation
- Gas Heating / Furnace
- Hot Water Heater Installation
- Gas Conversions
- Heat Pump Installation, Repair & Replacement
- Geothermal Installations
- Geothermal Heat Pump Repair / Replacement
- Ductless Mini Split Design, Installation and Repair
- Internet Thermostats
- Refrigeration
- Wine Systems
- And virtually anything that helps keep you and your family comfortable in your own home.
We didn’t install it? No problem: we’ll still fix it.
You’ll enjoy spot-on service and maintenance from the professionals at Weber & Grahn regardless of who installed your system. We service most manufacturers, including Carrier, Trane, Bryant, Lennox, York, Rheem, and Mitsubishi. With a fleet of computerized service vans stocked with the most commonly needed parts, you can count on fast, dependable service when and where you need it.
Manufacturers we install








Air Conditioning, Furnaces, Boilers, and Refrigeration Services in Islip, East Hampton, Westhampton, Hamptons, Sag Harbor, Riverhead, Smithtown, Hampton Bays, Southampton and Surrounding Areas with Gas Heating & Geothermal Options
Schedule a Service Appointment!