G.A.S. General Atmospheric Systems Frank in South Etobicoke 10/10 Furnace repair Over 7 years ago, After a long day and short notice G.A.S. was able to drop by my house and fix the problem in a timely manner. Before leaving I received a few tips on increasing the efficiency on my furnace. Trustworthy experience. Job Price Was this review helpful? Company ResponseThanks Frank!