Ressler & Mateer has served Lancaster County and the surrounding south-central Pennsylvania region since 1970, operating from its Brownstown facility with technicians covering Harrisburg, Lancaster, Lebanon, Reading, West Chester, Mechanicsburg, and York. The company installs geothermal ground-source heat pump systems using both vertical and horizontal loop configurations, selecting the approach based on site-specific land characteristics. Geothermal services are offered alongside a full menu of residential and commercial HVAC, plumbing, and water heater work. The company holds NATE certification, is accredited by the Better Business Bureau, holds membership in the Air Conditioning Contractors of America, ABC Keystone, and the Lancaster County Chamber of Industry and Commerce. Factory-authorized partnerships are maintained with Carrier. Emergency service is available around the clock at (717) 859-2025 or (717) 912-6923. PA contractor license PA008233.
Verified active operator per https://resslermateer.com/geothermal-services-in-lancaster-pa/ + https://resslermateer.com (PA import 2026-06-01)
Ressler & Mateer installs vertical & horizontal geothermal loops in Lancaster County and surrounding PA. NATE-certified, family-owned since 1970.
