We called out Hansen as our furnace had a pressure switch error. The tech (very nice gentleman) determined it required a new pressure switch without really looking into it to much. He came back later, installed the pressure switch and charged 400$ to do so. One hour later, the furnace had the same error, a new tech came out, checked the exhaust and found it was blocked. He fixed the block and voila. The next day I called to ask if the pressure switch was necessary work (which of course it was not) only to be talked down to by the individual working the phones. This was by far the worst customer service I have had in my life. Simple inquiry about whether the work seemed warranted and ended up very upset. The worst part is that both techs were very friendly, I wish I could say the same for whoever they have offering ",customer service"