Tech was nice, but system was working fine before he performed the fall checkup, but not after. During the check he raised the temp to check the heating so after he left we decided to cool the house off. That's when we discovered the system no longer worked. It went into waiting mode, still in it as I write this. We called the office and now we're stuck waiting for a tech to become available. Pretty much ruined our evening. Needless to say, we're not happy.