On Friday we got back home from Arizona to find our furnace had stopped working. It must have happened not too long before our arrival because the temperature had just gone down about 8 or 9 degrees. The unit was relatively old (16 years) so we knew it was time to replace it. We called around that evening to three different contractors (Reliance, Enercare, and Aire One North). Aire One was the first to call us back within 10 minutes and we are yet to hear back from the other twol!! They booked an appointment right away, arrived in a couple of hours, and found out that the heat exchanger was faulty. It was a Carrier furnace and qualified for an allowance of $700 on a new replacement. We opted to go ahead with the replacement. By 9:30am on Saturday the installers were back to help us get heat again. They were professional and neat. The work was clean and we had heat again by about lunch time . we will tell all our friends and relatives about our good experience.