Not Ranked
Not sure if that helps but, the vents to my guest rooms are closed. I know one thing that does work!. We Had a 14 seer Rudd heat pump installed and my power bill dropped 40%. The installer suggested and installed another return so, I don't believe I would close off any returns. All this depends on other factors best answered by you HVAC guy.
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Perry
Remember!, there's a huge difference between a 'parts' changer, and a mechanic.
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