We have used Greer's Banner Air for the last few years now. This last time we called them out to check the heater because it wasn't working properly. They had to clean the unit and put new batteries in the thermostat. They got it working pretty quickly. They offer excellent customer service, and we have been very impressed with the total overall experience. I have already recommended Greer's Banner Air on a few occasions, and I will continue to do so to anyone who may need heating and air conditioning service work done!