Geothermal.contractors

ThermAll Heating, Cooling & Electric has served Yakima and Kittitas Counties for more than 30 years, offering geothermal installation, replacement, repair, and routine maintenance alongside a full HVAC and electrical service menu. Their geothermal page explicitly distinguishes ground-source systems from air-source alternatives: ThermAll's geothermal installations use the earth's stable subsurface temperature rather than ambient outdoor air, providing more consistent efficiency across eastern Washington's cold winters. The company operates from offices in both Yakima and Ellensburg, positioning it to cover a large stretch of central Washington. Emergency HVAC service is available outside normal business hours. ThermAll's dual-city footprint makes it one of the few contractors able to serve both the Yakima Valley and the Kittitas/Ellensburg corridor from established local offices. Verified active operator per https://www.thermallheating.com/air-conditioning/geothermal-heating-and-cooling (WA import 2026-06-02)