Geothermal.contractors

Thomas G. Keyes, Inc. is a water well drilling and geothermal contractor serving southeastern Pennsylvania from Frazer, Chester County since 1945. The company holds a PA DCNR Well Drillers License (#248), a Chester County PA Health Department License (#10), a Delaware Water Well Contractor License (#23), and a PA Home Improvement Contractor License (#PA05511). Geothermal installations include open-loop systems that draw from an existing water well and return water to the aquifer, and closed-loop systems using vertical boreholes with polyethylene tubing circulating glycol. The company handles drilling, grouting, and pump service for both loop configurations. Primary coverage spans Chester, Delaware, Montgomery, and Berks Counties. Verified active operator per https://keyesinc.com/geothermal-systems/ + keyesinc.com homepage (PA import 2026-06-01)