Weber & Grahn has served the East End of Long Island from Hampton Bays since October 1968, holding a reputation as the premier HVAC and geothermal contractor across East Hampton, Southampton, Westhampton, Riverhead, and Sag Harbor. The company began designing and installing geothermal heat pump systems in 1985 using FHP/Bosch equipment, making it one of the region's longest-standing geothermal specialists. NATE-certified technicians handle geothermal heat pump installations, repairs, and Geothermal Warranty Service for most manufacturers. Weber & Grahn is WaterFurnace dealer and also installs Mitsubishi ductless systems and custom HVAC for high-end architectural projects. The firm holds Master Plumber licence 36162-MP and Master Electrician licence 38242-ME, and offers 24/7 emergency service across eastern Long Island. Licensed, fully insured, bilingual support available.
Verified active operator per https://weberandgrahn.com/services/geothermal-systems/ + WaterFurnace dealer locator (Bundle 6 audit 2026-05-29)
Specializes in ground-source heat pump installations across eastern Long Island with expertise in the South Fork's unique climate demands for year-round heating and cooling.
