My furnace wasn't firing up and was blowing out cold air instead of warm.I had two companies come out to my house to check what the problem was.Both companies quoted me thousands of dollars to repair my furnace.I was unsure whether they even knew what was really causing my heating problem.So I tried this company and the technician that came to test my unit figured it out in 20 minutes.My gas valve was old and needed to be replaced.He had the gas valve delivered within one hour and installed it for me.My furnace turned right on after the installation.185$ for great service compared to the thousands the other companies tried to charge me.