Our experience with Sierra Air was very, very good. Tim was our technician and was very courteous and was on time. He called ahead of time to let us know about when he would arrive. Work was done in a very professional manner. Explained what he had done and what was covered by using their service. We hope for a long standing relationship with Sierra Air to keep our AC and heating system running at its most efficient ability. I would highly recommend this company and a big THANK YOU to Tim for being the kind of person he is.