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"There were two people fromGreen Electric Heating & Cooling Corp. who came to do the tune up for my gas heater. Both of them know what they are doing and provided explanation of what they were doing. They were respectful and answered all my questions. They cleaned up and gave me a folder to keep.Performed tune up of gas heater. Cleaned and explained how heating system works."
<https://www.greenhvacair.com/residential/indoor-air-quality/>