DESCO Services, also operating as DESCO Energy / Diehl's Environmental Services Company, Inc., is an HVAC and commercial refrigeration contractor founded in 1977 and located at 525 Wilson Ave, Hanover, PA 17331, serving Hanover, York, and Gettysburg. The company holds PA contractor license PA004683 and is BBB Accredited with an A+ grade. Its geothermal work covers closed-loop and open-loop ground-source heat pump installation and repair, including vertical boring and site-specific engineering for soil density, moisture, and well depth. DESCO also handles commercial refrigeration, ventilation, heat recovery ventilators, and energy recovery ventilators, with preventative maintenance contracts. Free estimates and 24/7 emergency service are offered, with additional offices in York and Gettysburg.
Verified active operator per http://www.desco-services.com/ and the BBB A+ profile for DESCO Energy (PA bundle audit 2026-06-01).
Established since 1977, DESCO Services offers all three geothermal loop types (open, closed, and vertical well) with units up to 30 EER efficiency and provides site-specific system design accounting for soil conditions and location factors across Hanover, Gettysburg, and York.
