Not using them but I do like to close off some of the vents in the
bedrooms to save money/energy by only cooling the occupied parts of
the house during the day. I know you're not supposed to close off too
many vents though as you can create too much backpressure and burn out
your blower motor.
I don't think you should cover the return, as I think that would
stress the blower even more.
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