My furnace stopped working, and I called Atco. The guy who came over said two light flashes on my furnace indicated my pressure switch wasn't working. Told me I could replace it easily, and so I did (I have no experience with furnaces). When I went to turn it on in September it didn't work. Called Airtech. The guy found that I had simply reversed the two tubes (I had taken pictures of the original and done it the same way but I guess it was not the same). The furnace immediately began to work . He proceeded to look at the furnace for another 20 minutes. Talked with me for a few more, and tried to get his work phone to work. Went to his vehicle for a few more minutes. Came back said the total was 99.75! The invoice he sent also said he worked 0.75 hours. He fixed it in 5 minutes, and didn't spend more then half hour total! I could have understood max $60 ($120 an hour/half an hour). Really disappointing.