My air conditioner is a Trane. It was installed in August 2007 and we have had a routine maint. service call every year - no problems until now. It stopped working sometime Saturday P.M. I noticed that it wasrunning constantly but the house was warm -- so I cut it off. A man came yesterday afternoon and the problem is in the part that sits indoors (as opposed to the compressor which is outside). It will cost $1200 to fix....parts and labor. The temp here was 94 in the house with the windows opened - and I'm not brave enough to have them open at night. Anyway, we only paid a little over $5,000 for the a/c when new. The service dept is going to call me today and set a time to come out and work on it - providing they can get the part without a problem. Question -- when is it more economically smarter to just buy a new a/c and not try to fix the old one. The part (I was shown) is a copper part that looks o.k. - it just stopped regulating the freon). One thing that did tick me off -- the service man who came out was more interested in selling me a service agreement that would take a discount off future service calls and parts and include routine checkups. I have no idea if I will stay here (recent widow) after the market improves but I am thinking about trying to get smaller place, less upkeep, and really don't want a three year service agreement. Just wondering what you'll thought.