We asked for an estimate on a replacement system for our HVAC which had a burned out compressor. The technician came out and gave us the highest bid out of the seven contractors which I called for estimates. I was at work when he came out and dealt with my wife. He wrote up the estimate and then he said he would try to find out what was wrong with our system (my wife told him it was the compressor) and to add insult to injury, he charged us for a service visit. I assume they stay in business by preying on those who are naive and the elderly.
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