The Gentry Service technician, Jeff Thomas, called ahead to say he'd be arriving on time. He did an outstanding job servicing our geo-thermal HVAC system and water heater, so we'd be ready for the summer months. Jeff is a very courteous and knowledgeable technician, and he left the house cleaner than when he arrived! Our HVAC system and water heater were installed by Gentry and they have kept them working properly for the last 9 years. I highly recommend Gentry for your HVAC system needs.