About
Danisi Energy Company has served Long Island's Suffolk County from their Medford location at Route 112 since 1965, building over six decades of expertise in HVAC, fuel delivery, and geothermal energy solutions. The company installs WaterFurnace geothermal heat pumps, extracting earth-stored energy through a ground loop to provide efficient heating and cooling without fossil fuels. Their geothermal page explains the full earth-loop installation process for Hampton Bays, Medford, Southampton, Port Jefferson, and surrounding communities. Services include oil delivery, ductless mini-splits, plumbing, electrical, water heaters, and indoor air quality. Managed by President Siegfried Mangels and General Manager Christopher Ghosio, Danisi Energy holds a BBB A+ Accredited rating with continuous accreditation since 1997. Two contact lines: main (631) 732-6666 and East End (631) 283-0400. Verified active operator per https://www.danisienergy.com + https://www.danisienergy.com/geo-thermal-energy-solutions/ (Bundle 6 audit 2026-05-29)
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Danisi Energy CO — Medford, New York
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