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"He went over everything, even the source gas line for the heating which is under the house and goes up through the wall to the attic., and took a shop vac up in the attic to clean out the system. He made some suggestions, since the tubing is not the grade that should have been used when the system was installed.  He was not pushy just informative. I have decided this will be the only company I will use for this service in the future, and will hire this company to change the gas line when I have the money to do so. Never felt as comfortable with any contractor before. I highly recommend to anyone searching for this type of HVAC services.I received the notice for pre-winter tune up special for HVAC system from Angie's List. My Heating/cooling unit is new (2 years old) but was installed in the attic. Unable to go up there myself I like to have someone go over all the mechanics of the system before I go from cooling to heating and vice-versa. I have had other companies do it before this one, but never as efficiently or professionally as this company did."
<https://www.greenhvacair.com/residential/indoor-air-quality/>