1 Air Return. Your air return is the part of your system that marks the starting point of the ventilation cycle. … 2 Filter. Your filter is the second part of the air return in which the air is drawn through. … 3 Exhaust Outlets. … 4 Ducts. … 5 Electrical Elements. … 6 Outdoor Unit. … 7 Compressor. … 8 Coils. … 9 Blower. …
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