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  1. #1
    Join Date
    Jan 2007
    Location
    Portland, OR
    Posts
    55

    Post Do I need zoning?

    I have a two level 2100sq ft house. The problem I have is the upper floor is usually 10 degrees warmer then the lower level. When it is 95 outside, if I have the stat set to 73, it will be at least 85 upstairs. If I want it to be 75 on the upper floor on a warm night, I have to crank the AC down to 65.

    All of the vents are currently 100% open. Is it normal to expect a 10 degree difference between the upper and lower levels? Does the house just need to be balanced, or, does it sound like there might be some other problem?

    I have been thinking of zoning, but, want to make sure there is not something else going on first.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,591
    Any returns on the upper floor.
    Are all the ducts/supples accessible.

    You might try balancing first. It cost less, and may get results good enough that you don't need to zone.
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  3. #3
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by The_Pickle View Post
    I have a two level 2100sq ft house. The problem I have is the upper floor is usually 10 degrees warmer then the lower level. When it is 95 outside, if I have the stat set to 73, it will be at least 85 upstairs. If I want it to be 75 on the upper floor on a warm night, I have to crank the AC down to 65.

    All of the vents are currently 100% open. Is it normal to expect a 10 degree difference between the upper and lower levels? Does the house just need to be balanced, or, does it sound like there might be some other problem?

    I have been thinking of zoning, but, want to make sure there is not something else going on first.

    My similar problem was solved by a combination of sealing massive basement leaks in my return system (the air was taking the path of least resitance)...and by insulating my attic with R-30 batts.

    Key1
    In the land of the blind.....the man with one eye is king....

  4. #4
    Join Date
    Jan 2007
    Location
    Portland, OR
    Posts
    55

    Both levels

    Quote Originally Posted by beenthere View Post
    Any returns on the upper floor.
    Are all the ducts/supples accessible.

    You might try balancing first. It cost less, and may get results good enough that you don't need to zone.
    There is a return of both floors. Although it seems like there is much less draw on the upper floor return. All the duct work on the upper floor is in the attic, lower level is in the crawl space. All accessible. It does seem as if the draw on the upper return is much less. Hard to tell though as I have no special tooling.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,591
    Your system is easy to zone then.

    Your second floor return is probably undersized, and that can hurt a lot. When trying ot cool it.
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    How many times must one fix something before it is fixed?

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