My old poor AC unit is on its last legs. It just barely is keeping the house cool. I called a friend who owns a heat and air out today to check it out. He said that it is a dinosaur, that my unit was made in 1985. He couldn't believe that it was still running at all. He told me that I had gotten all the goodie out of that machine. So it's time to replace, I had no idea that a central heat and air unit was so expensive.