Size Finishing
Sep 27
2010
2010
I have central air & heard it's more efficient to leave the fully finished full size basement vents open?
Is that true? The basement is just as large as the 1st floor. About 1000 square feet.
you can close down the vents a little at a time (like half shut .... 3/4 shut then all the way shut) in the basement during the summer. closing the lower vents will slow the airflow across the evaporator coil and may cause the unit to freeze. you need to keep an eye on the suction side line (the big copper line going to the condenser) to watch for frost. if the suction line starts to frost, you need to open the vents back up.
since cool air is heavier, the lower floors will naturally be cooler. by shutting the basement vents, you force the cool air upstairs where it will do the most good.
Possum, HVAC guy
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