We had our HVAC system in our new home stop working and the digital display thermostat quit. We replaced the transformer with a part the company had on hand but realized after the fuse blew that would would need a repairperson. The company sent a young man who was professional, courteous, and very knowledgeable. He had a part that would work on hand and fixed the AC is a half hour. We appreciated the swift service and parts on hand so they would not need to make a return visit!