I’ve been a customer of R&D for over ten years and they are consistently excellent in preventive maintenance inspections and solving any problem I’ve had. Bob Drumheller is the complete professional, and his knowledge of systems and troubleshooting is the best I’ve ever seen. He is totally thorough, and never cuts corners. I’m thoroughly satisfied with R&D and would recommend them to anyone looking for honest and knowledgeable Heating and air conditioning professionals.