G Force Air offers outstanding service at a competitive price! Our heater was not working properly over one of the coldest weekends yet in Toronto. Mark from G Force Air called back within a half an hour of my request and was able look at the furnace almost immediately. Mark was very knowledgeable and helpful in explaining the cause of the problem and even took additional time to go over preventative measures and suggestions for better furnace performance. I would definitely use G Force Air again and would recommend this company to friends and family.