I have used Tier 1 for 4 years and am ver impressed with their service. One thing I really like is I get the same technician and sales people. When they come to the house they know what needs to be done and they don't try and sell me extras. I had used 3 other companies and none compare to the level of service and trust I have for Tier 1. The company that originally installed the furnace in my new he couldn't figure out an issue, but Tier 1 solved it within 10 minutes. Another company charged me double the cost of everyone else, that must be to cover all their media advertising. Tier 1 is honest and very fair. Chris the sales manager, and Dave and Brad are excellent at customer service and always do a great job! I highly recommend them for any type of heating or cooling!