I called around lunch time to make a service call & was told that they weren't sure if they were going to be able to get to me that same day as it was a pretty booked up Monday, but that they would try. I was pleasantly surprised when I received a call later that afternoon saying they were only 20 min away from house & would be there shortly. We had called because after replacing the batteries in our thermostat, our thermostat no longer triggered our A/C unit to turn on. It took him about an hour to diagnose the source of the problem (a wire would occasionally touch a copper pipe within the the unit & short itself out when running) and repair it. He then discovered that this had fried our thermostat & that it needed to be replaced. However, he didn't have any programmable thermostats with him, and the non-programmable thermostat he did have on hand was going to cost me about $100 (including the installation). I did a quick search on Home Depot's website only to discover that programmable thermostat's are only like $30 each, and decided to go buy a new thermostat & install it myself. He walked me through the entire process & made notes of which color wires to attach to which letter, which settings to watch out for when programming the thermostat so that I programmed it correctly for our system, and how to turn on the master switch outside. Overall, the technician was at my home for about 3 hours, but I was easily able to install the new thermostat myself using the notes he gave me & now our house is much cooler than before it had ever broken. I would definitely use them again, but I would not recommend having them install a new thermostat of theirs because the upcharge on the non-programmable thermostat was ludicrous.