We moved into our house a month ago. When the home was inspected it was too cold to test the AC (mid Feb in PA). The sellers offered a home warranty so we thought that was enough. A few weeks ago when we turned on the AC it appeared to not be working properly. We set the thermostat to 70...the AC turned on, ran for about a 1/2 hour and turned off. We thought it was a thermostat issue but reset it and still had the same problems. Last week we called our home warranty company and they sent out a technician. The technician determined that it was the compressor. We have a 2 ton Goodman system that was installed in 2001. The compressor is no longer under warranty so the home warranty company will partially pay for the compressor to be replaced. The technician also stated that the returns and ducts in our basement were not installed properly and should be replaced in order for the system to operate efficiently. We decided called another company for a quote. The 2nd technician also agreed that the compressor needs to be replaced but suggested upgrading to a 13 seer condenser instead (currently we have 10 seer). First because it would be more efficient but second because the warranty would be 10 years versus 1 year on the compressor. Which one should we replace? He also stated that the returns and ducts in our basement were not installed properly. He stated that our system required 800 CFM and it was only set up for 300. Is that important? Being new home owners we are trying to keep our costs to a minimum but also get our AC back up and running properly. Any suggestions would be appreciated.