I called the other day and left a message on Carl's voice mail. But instead of Carl, Charlie Detrich called me back. Unfortunately, he said Carl is no longer with Alternate Heating Systems. I was very sorry to hear that Carl isn't with them anymore. He was very friendly, helpful and informative. Not to mention patient. He always seemed to go the extra mile for the customer. He always explained everything completely.Charlie didn't seem as helpful as Carl but I'm willing to give him the benefit of the doubt. He does seem like he is going to try and take care of my issues. I see from their website that Charlie is actually the VP Operations and he joined the company October 12, 2009. So maybe he is just filling in till they find someone to replace Carl. So hopefully their support will remain as good as it's been. Anyway I just wanted to let everybody know what's up with Carl. And wondered if anyone else had dealt with Charlie yet.