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  1. #1

    question about ductwork high and low return

    my two story colonial home 2300 to 2400 sq ft. used to have furnace and ac, now has furance and heat pump, has supply register on floor in each room, and opposite wall has two return vents, high and low, distance between each register and return vents more than 10 to 15 ft apart. i remember my builder told me open high close low during winter, and open low, close high during summer, now my installer gave me a lecture about proper air mix, told me to do the opposite.

    is it just a personal preference, can leave both open as well?

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,744
    We have always gone with the opposite theory. If the supply is low we install the RA high and visa-versa.

  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    Leave them both open summer and winter.
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    How many times must one fix something before it is fixed?

  4. #4
    Hi, Beenthere
    thanks for your good advice.
    i've tried leave both high and low return vents open in each room, not sure if it is pschological or not, i feel more volume of warmer air coming out at the register, at least the 4 ton heat pump cycle on only 13 to 15 minutes per each run every 45 minutes when outside is 32F +, only consume about $2 to $3 of electricity per day.

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    By leaving both open. Your letting the return pull as much air as it can so you get more supply. plus your getting that hot air off the ceiling and mixing it with the cooler air that is on the floor. Evens out the room temp.
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  6. #6
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,224
    Here we go again

  7. #7
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,224
    Agree with Beenthere, leave them both open. This will give the supply registers more airflow and thus more throw.

  8. #8
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,778
    Quote Originally Posted by beenthere View Post
    Leave them both open summer and winter.
    X2, your system will most likely last longer that way.

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