I heard a great recommendation about O2 duct cleaning and decided to give them a try. We had two units whose ducts desperately needed cleaning. The crew seemed a bit rushed, and I had to point out the heat registers they missed. After they finished, I tested furnace in my unit, and it worked. My mistake was to have skipped testing the other unit's furnace. Later, I got an urgent email from my tenant, stating that the furnace would not turn on after he returned home. I am not the do-it-yourself type, so I was forced to hire a heating tech on a Sunday. It turned out that the pilot light was off. Yes, the pilot light could have gone off independently of their cleaning the duct. However, the furnace worked before they came and failed after they left. I learn an important lesson: for contractors, you must check every single piece of their work. Once you hand them a check, the game is over. If you decide to use O2, be sure to demonstrate to them that the furnace is working before they start and to check that the furnace still works after they finish, unless you know how to handle your furnaces.
The reason I gave them a two-star rather than one was because Kirk noticed that the insulation was too close to a heat source and was getting black. He tightened up the insulation. However, their being rushed and their failure to check furnaces after they finish so that I had to hire somebody else to fix the problem prevent me from giving them higher ratings.
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