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"The company promptly scheduled the service. The technician called me 1/2 hour before he arrived to let me know he was on his way. He arrived at the scheduled time. He explained to me what he was doing and that the system was functioning well even though it was an old furnace. I asked him about a possible replacement and he explained the various options and the Pros and cons of each option.An air conditioner complete tune up."
<https://www.greenhvacair.com/residential/indoor-air-quality/>