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  1. #1
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    Central air question

    So while I was lying awake in the middle of the night last night I started thinking about our central air fan. We leave our fan running all of the time whether the furnace/air is on or not. My thought was there was value in keeping the air circulating.

    I still think there is but I was wondering how much, if anything, this costs me? So that got me wondering what other people do and what the pros/cons of constant fan vs. auto-off might be?



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    Re: Central air question

    I've read that it takes more energy to start and stop the motor than it takes to keep it running constantly, so you're proably better off doing it that way. I've tried it, but don't like the constant noise of the fan running.



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    Re: Central air question

    It does cost you something, but not all that much. Our new Furnace/AC has a setting where it will turn on every 15 min, and run for 3 min to move the air around, and then turn back off.

    We went from the cheapest one possible to a super high efficiency last year, and our mid american bills went down by $100 a month and our house is about 6 degrees cooler.


    They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety. - Benjamin Franklin 1775

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    Re: Central air question

    auto man myself. I can't believe the monetary difference is significant enough to matter either way. I'd go with whatever you prefer for house comfort.



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    Re: Central air question

    Makes sense to have on all the time to move the air around, but it's still running when no one is at home. At least with auto it runs with the program.



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    Re: Central air question

    It is true that the start up burns much more energy than leaving a circulating fan going. One of the major problems with AC units is it's inability to judge actual temperature in a house as a whole. 90% of these new hi efficiancy AC units get their energy savings by staying on continuosly and cooling the air gradually, instead of a dropkick explosion of cold air when it goes above your desired setting. So to finalize, don't worry about the fan running beacause it is moving cold air around the house and keeping the motor from running more. Hope this helps



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    Re: Central air question

    Quote Originally Posted by brianhos View Post
    It does cost you something, but not all that much. Our new Furnace/AC has a setting where it will turn on every 15 min, and run for 3 min to move the air around, and then turn back off.

    We went from the cheapest one possible to a super high efficiency last year, and our mid american bills went down by $100 a month and our house is about 6 degrees cooler.
    What did you get?



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    Re: Central air question

    We're putting in a new furnace/AC later this summer/fall. Considering both a very high efficiency furnace and a heat pump (not ground heat pump). The savings for both sound great, and the local company says half of everything they're installing in the area is heat pump. Anyone have experience with one?
    BTW, that sales guy also says running the fan only on a regular central air is fine.


    Last edited by Ms3r4ISU; 07-27-2008 at 11:27 AM.

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    Re: Central air question

    Had a neighbor Friday night start talking about this and then the booze hit, so I missed part of the conversation...anyway here is my dumb question and haven't looked into it on geothermal heating/cooling; can you switch over from traditional high eff unit to a geo?
    Cost/benefits?
    Thanks


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