Geothermal.contractors

Hoff Heating & AC, founded in 1983 by Henry and Karen Hoff, has grown from a home garage operation to a 45-plus employee company serving St. Charles, Lincoln, Warren, and St. Louis Counties from its O'Fallon base. The company specializes in GeoComfort geothermal heat pump installation and service and is a Lennox Premier Dealer with NATE-certified technicians and ACCA membership. They offer comprehensive geothermal services including system installation, maintenance, and repair for all makes and models, along with free on-site consultations. Geothermal systems from Hoff deliver up to 70% utility savings, 25–50 year equipment life, and quiet operation. Additional services include furnaces, air conditioners, ductless mini-splits, and indoor air quality solutions. Their commitment to service is backed by a 4.9 Google rating across 1,500-plus reviews, an A+ BBB rating, and Angie's List Super Service Award recognition. Service areas include St. Peters, St. Charles, Wentzville, Lake St. Louis, Troy, Chesterfield, Warrenton, and surrounding communities. Verified active operator per https://hoffheating.com + https://hvac-contractors.acca.org/company-profile/hoff-heating-and-air-conditioning-inc-o-fallon/ (Bundle 5 audit 2026-05-29)