When we moved into our house in Summerlin in early 2015 we knew we were probably living on borrowed time with the original 22 year old Carrier system. After two summers during which it continued to perform well we decided to stop pushing our luck and called Air Supply. From the first call the Air Supply team demonstrated their professionalism and interest in insuring that the job was done correctly and at a fair price. We chose to stay with Carrier and, on Itzhak's advice, upgraded to a 17 SEER Infinity heating/cooling system. I knew that the new 2 stage system would pose some problems for the installers since my old thermostat was only connected with a 5 wire cable. Despite that limitation, the Air Supply crew, led by Jose, spent an hour and a half in my attic running new thermostat wiring to insure that the system would operate as designed (at no extra charge by the way). The installers were top notch and by the end of the day the new system was up and running. What impressed us most was the communication we received from the Air Supply office staff who kept us advised as to what to expect before, during and after the install. A few days later Mike and his crew arrived to perform a whole house duct cleaning to complete the job. There are a lot of choices in this valley to choose from for HVAC work. Our experience suggests you won't make a mistake by choosing Air Supply.