The serviceman was friendly and smiled well. It took 3hrs. to find the problem with my a/c. I paid $300 for his investigative services. After 1 hr. I searched for him in the utility room, at the a/c unit & in the cab of his truck, not there! I can only guess he was in the back of the truck. (not working in my a/c). He finally got my a/c to work. He switched the fan setting from "auto" to "on"! I was told the a/c would only work if I left the fan setting "on". I was told I need a control board and told he could install a new control board and 2 new thermostats for an additional $450. Of course my thermostats work just fine! What he did not know was that I was getting a 2nd opinion and the repairman before him diagnosed the problem, cleaned and serviced the unit, all in about 1hr and charged $110. Figure it out for yourself. Never again!