Coretemp Heating and Air

I have used Coretemp in the past and their service has been excellent. I recently had to call them on a Friday night about an issue that a plumbing contractor was telling me was a furnace problem. They answered the phone (on a Friday night!) and directly explained to the plumber how this was a plumbing issue and how to fix it. When I offered to pay for this very valuable advice, they refused to take any money. Outstanding professionalism!