A few months ago we had a new air conditioning and heating system installed. We had done a lot of research first, looking at all the major brands like Carrier, Amana, Bryant, Lennox, Trane, and American Standard. We got quotes from companies that carried the one or two brands we liked. In the end, we chose based on the company that quoted us, the kind of support we received, and the price. The system to be installed was the Lennox XC21 with iComfort Thermostat, which had a large color screen, high and low temperature settings, and a wifi connection for smartphone control and weather updates. In the end, the a/c system works well, but the thermostat has issues.