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    Peff's Avatar
    Peff Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 18, 2007, 07:47 PM
    Insufficient AC air return
    Last year I had a fly by night guy install a/c in my home and now I am suffering for it. The ducts are a complete mess, but I cannot afford to have it professionally repaired right now. The AC unit is a 10 S.E.E.R. unit rated at 22,500 BTUH. My home is an old two-story house. There is a trunk line in the attic supplying 6 six-inch vents for the second floor. The evaporator, main supply trunk line, and 4 six-inch vents for the first floor are in the basement. There is 10 inch flex line connecting the trunk line in the basement to the trunk in the attic. The AC was set up with only 1 six-inch air return line and open vents on the return line trunk. I will be upgrading the returns, but I need some help in determining how much return air I値l need. I am planning on using galvanized pipe for the returns if possible, but I値l use box style ducting if necessary. Any suggestions will be greatly appreciated. Thanks!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 18, 2007, 09:50 PM
    Make sure you insulate all duct in attic.
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