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Because it helps the air in the house circulate better, so the overall temperature of the house is more consistent.
The thermostat is in one location, so depending on the duct layout, the return intake might start sucking cold air in before most of the house is cooled, causing it to shut off too soon.
Because it helps the air in the house circulate better, so the overall temperature of the house is more consistent.
The thermostat is in one location, so depending on the duct layout, the return intake might start sucking cold air in before most of the house is cooled, causing it to shut off too soon.