When my furnace stopped functioning, late one winter night (-27C) I thought I would call the man who installed the furnace in the morning, since I turn down the heating at night, anyway. He said he would come by, and have a look. In the meantime, I cleaned the flame sensor, to no avail. When he arrived, and examined the furnace, he diagnosed, and replaced a couple of parts, including the flame sensor, with no success. Looking at the printed circuit board (on a high efficiency furnace), he said he had no experience with that part of a furnace, and that I should call someone else (much more involved, but to keep it short). I called several companies (the obvious ones, all too busy, some till next week) then went on to Homestars, and discovered Calgary Heating Services. After reading reviews, I called, and they sent someone out in a couple of hours. Mohsin looked at the furnace, and went through a series of diagnostic steps, and determined that the blower motor was not functioning, nor responding; it had died. As it was late on a Friday afternoon, and the manufacturers parts store was an hour away, he said Monday morning was the earliest he could return, unless I wanted to pay a fee to the parts store of $150 to have someone open it on a weekend. Since I declined the offer, and was already using some space heaters, he brought in a few more to help me over the weekend. He arrived promptly Monday morning, with a new DC 1 hp replacement motor, tested it before installing, and had it up and running within the hour. That was the best money I have spent in a long time. A lifesaver!!! Highly, highly recommend this company for furnace repair – experienced, well-trained, professional, polite, and very accommodating technicians.