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  1. #1
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    Question Less BTUs Blowing Colder

    I have a older window AC unit thats 8,000 btus and a brand new lg unit thats 15,000 btus. The newer bigger unit is blowing 3-4 degrees warmer(53 F) than the smaller older unit(50 F)... whats going here? both are on the high fan setting.

  2. #2
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    Mar 2013
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    Billington Heights, NY
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    BTUs are only a capacity measurement. Temperature is based upon efficiency, air flow, loadings, and amount of refrigerant.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  3. #3
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    Thread Starter
    ignore

  4. #4
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    Thread Starter
    Quote Originally Posted by HVAC_Marc View Post
    BTUs are only a capacity measurement. Temperature is based upon efficiency, air flow, loadings, and amount of refrigerant.
    what does my situation mean then

  5. #5
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    Mar 2013
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    It means that you should quit worrying about it. It will work fine. Something as simple as the fan spinning a little faster could cause a higher temperature coming off the coil.

    Even identical units from the same manufacturer are different.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  6. #6
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    Oct 2010
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    Anderson, South Carolina, United States
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    It's more efficient than the old one. It's working as designed. Case closed.

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  8. #7
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    Jun 2017
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    Rockledge, Florida.
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    The capacity of the unit is a measurement of how much energy is being pulled out of the indoor air and moved outside. The energy exchange is a function of the amount of humidity removed from the air (latent energy) and the change in temperature of the air (sensible energy). Both of those are heavily affected by the mass flow of air moving through the air conditioner. The larger unit almost certainly has a much larger mass flow of air due to having a larger fan. To do a capacity comparison you would need to measure how much moisture is coming out of the air, the mass flow of the air, inlet temperature, and outlet temperature. Since you have only measured one of those four parameters you can't really reach any conclusions.

  9. #8
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    Aug 2012
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    maybe you should have bought a 60000 btu window shaker.

  10. Likes Ceilingfan liked this post

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