I had 3 other HVAC companies come out to a recent rental house we had purchased to check out the existing equipment and to determine why the heater was not working properly. None of the other companies were as professional nor could they determine what was wrong with our unit. David from Doctor Cool & Professor Heat came out the same day I called his company and quickly determined and corrected our issue!! I strongly recommend this company and the excellent staff!! Do yourself a favor and call this company first --- they are the best!!!!!!