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There is a vent in the duct directly above my furnace. This is in the air out side, not the return duct.

Is there a reason I should have this duct open? It was open when I bought the house a few months ago, but this seems like a waste, heating and cooling the basement.

If there is a reason to have it open, should it be open only during certain seasons? (Open for heating, closed for cooling, etc..)

This is an Amana AMEH800805CX. (pictured below)

enter image description here

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Looks like the supply side. Most likely previous occupants wanted to add a little heat/AC down there. Is it adjustable? If not you can add an adjustable register because you may find that the climate control added there was needed. Maybe for humidity, etc.

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  • It is adjustable
    – user34354
    Jun 17, 2018 at 17:56
  • Well you're all set then. If you have a little workshop down there and get a little chilly in the winter you can just crack it open a little. I've actually considered adding one in my garage, lol.
    – vin944
    Jun 17, 2018 at 22:17

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