I live in NC and the summers here do get pretty hot (like 100 +) in the summer. We purchased a new home Nov 2011. It is 3500 square feet evenly split between top and bottom floors (no big open lofts or anything). There are 2 HVAC units, one for up and one for down-each floor has 2 air returns. I don't know all the details about them, but they are Carrier brand 58sta/stx. Both appear to be the same size.
Now, since we purchased the home our upstairs has never been able to cool down. (not even if it is only 75 degrees outside) The air coming out of the vents is like... a little cooler than a fan and will not lower the temperature at all in the upstairs.... We had a one year warranty on our air conditioner and it has now run out. I have had two companies come out to our home a total of 11 times. Yes, 11 times. Every time they come the fluid is entirely gone or almost gone, so they have always just refilled the fluid and "stopped leaks". The 2nd to last time we had someone come out our builder actually called anther company- This company said the whole unit needed to be ripped out (something about a compressor not condensing or something), so the original company that installed came out and replaced the whole unit.... IT STILL DOESN'T WORK UPSTAIRS!!! I am at wits end and now that our warranty is out I really don't know what to do. I don't want to pay $ or more for every one of these fixes that doesn't work... Also, just a note- The only time our airconditioner worked after a fix was when one of the guys put in "way too much" freon; it was awesome, but very temporary. Could there be a leak they are not finding... like in our walls or something?? With how things are going, I could see spending $+ and still not having a working air conditioner, lol- any ideas as to what the problem could be??