The BellSimons Companies was founded in 1940 as The Bell Pump Company, operating out of Hartford, Connecticut, rebuilding oil pumps for the heating trade. By the late 1940s, locations in New Haven, Connecticut and Springfield, Massachusetts, opened to better serve the professionals in the residential and commercial fields.

Energy General provides R2B2 and EG3.0 Smart Energy Analytics, Energy Efficiency Consulting, Energy Audits, Renewable Energy, and Energy Science and Research.

HomeServe USA Corp. is a renowned provider of HVAC systems, equipment and home comfort solutions. The services offered by the company include Plumbing, Sewer Line, Heating & Cooling Solutions, Electrical Wiring, Water Service Line, Gas Line, Septic Line, Heating Tune-Ups, Cooling Tune-Ups, and Hot Water Heater Repairs.