KAHL AC is outstanding! Our thermostat went out on a very COLD Saturday night and they were at our house immediately to help us out! They were up front about the price difference for an emergency visit and gave us our options. Our technician, James, was great! He had discovered that our thermostat was still under warranty and took care of getting it replaced for us. I has asked him about their maintenance plan and jumped on getting a contract since it was so reasonable!