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I wondering if I need a cold air return in my basement. I have 3 bedrooms upstairs two of them have returns in them and one in the living room, I am adding another return to the 3rd bedroom tonight when I get home. I have a ranch style 1475 sq ft home with full basement, with 3 more bedrooms down stairs it's about a 75 % finished basement . The people that lived in the house before me took the 4 bedroom's upstairs and made 1 large master bedroom and left the other two alone. They didn't add a cold air return in my room so I am adding it tonight, just wondering if I need one down stairs or not ???? 3 ton 13 seer unit
 

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Jack of all - master none
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Typically, just blowing conditioned air into a room (hot or cold) is not an efficient means of heating/cooling the room. You also need a path for the air already in the room to leave. If you want to heat and cool effectively, you need returns.


...but I'm not an HVAC pro.
 

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You can't just keep on cutting in returns left or right. I would get someone to balance or at least check out your duct work before you add another return.
 
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