I used the phone book to find Jackson Heating & Air Conditioning. We have hired them to come out to check out our units. They have also done an assessment of our heat ducts to make sure that we are getting the kind of heat that we are supposed to be getting. We also had trouble with the exhaust motor and switch and switched out the fan to get it back operating again. So far, I have interacted with two technicians who were excellent and confident; even the the president of the company came out once to make sure things were functioning as they should. I would recommend this company.