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  1. #1
    Join Date
    Apr 2010
    Location
    Raleigh, NC
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    1

    Default Help making AC more efficient

    We just bought a 2-story house. I need pointers on what to do to make AC/Heat more efficient. Do I close downstairs vents, close doors upstairs, what about crawlspace vents? Upstairs master bedroom does have ceiling fan which we run during the night.

  2. #2
    Join Date
    Jul 2009
    Location
    Northeast
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    661

    Default Re: Help making AC more efficient

    Is there a problem with the way it's running now? I wouldn't think that someone would put a supply in a crawl space, that would just invite critters to move in. You should have an HVAC contractor do a PM just to make sure everything is working OK, both Heat and AC

  3. #3
    Join Date
    Jan 2010
    Posts
    163

    Default Re: Help making AC more efficient

    Closing off registers is generally not a good idea because it is very common for houses to have duct systems that are already only marginally large enough to handle the airflow from equipment that is often over-sized for the home's needs.

    When you start closing registers, you restrict the airflow further, thereby reducing the efficiency of the equipment. This is especially a concern for A/C, since cooling capacity and efficiency are directly related to adequate airflow. A 3-ton unit can perform like a 2-ton unit if airflow is restricted.

    Crawlspace vents: (assuming you mean vents to the outside) depending on the climate, it is generally good to open the vents in summer, but close them in winter.

  4. #4
    Join Date
    Feb 2010
    Location
    Iowa, Quad-Cities area
    Posts
    129

    Default Re: Help making AC more efficient

    Quote Originally Posted by Dave Wright View Post
    We just bought a 2-story house. I need pointers on what to do to make AC/Heat more efficient. Do I close downstairs vents, close doors upstairs, what about crawlspace vents? Upstairs master bedroom does have ceiling fan which we run during the night.
    Depending on a number of factors, I would consider zoning.
    Your current thermostat is (probably) downstairs, with zoning you would also have one upstairs.
    Each floor can have it's own setting depending on day or night.

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