I had 3 different technicians out to the house, and they could not figure out the issue with my system (All charged me around 300$). I call Green Mountain and they were in and out within 10 minutes, blowing ice cold. i told the owner, my issues with the other companies and he felt for me, only charged me 50$. I could not believe it! This is the company! My next door neighbor heard my story and used them for a whole new system a few weeks later. They are excellent people and very talented. Call them if you are having issues.