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  1. #1
    Join Date
    Feb 2009
    Posts
    23

    Default whats the problem

    Hi,I recently had new central ac installed in my home. I live in New Jersey and the summer has been brutal to say the least. I usually keep the thermostat at 79 when the outside temp is 85-95. However when it is 95 degrees or higher outside,I put the set temp to 76-77 degrees. I've noticed that my home will not get any cooler than 79 degrees.Is there something wrong with the unit or could there be an insulation problem etc. I have a 2 story cape cod and the unit is a 2 1/2 ton Rheem. Any insight would be greatly appreciated.

    THANKS

  2. #2
    Join Date
    Jan 2009
    Location
    Needham, MA
    Posts
    559

    Default Re: whats the problem

    there's a few things it could be but my first guess would be the insulation in your walls, insualtion in the attic or above the ceiling upstairs and the windows not having low-E glass.

    anything you know about those issues? it's a good place to start.

  3. #3
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    3,188

    Default Re: whats the problem

    There is a calculation for figuring out how much tonnage you'll need. Some of it is straight forward math, some is estimating, such as how much shade that nearby tree will give. Sounds like the unit is undersized. Time to start speaking to your installer for a larger unit which they should upgrade for free since it was their mistake.

  4. #4
    Join Date
    Jun 2012
    Posts
    19

    Default Re: whats the problem

    What is the square footage? This may be a small unit considering the zone you are living in. Zone 3. Typically 1300 to 1600 sq feet for this area a 2.5 ton unit should work. But since the summer is unseasonably hot this may be all that it can muster.

  5. #5
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    7,762

    Default Re: whats the problem

    It's entirely possible that your unit in too small or your insulation is not perfect, but frankly, I think that you're demanding too much from your poor A/C.

    What I don't understand is why you want 79 when it's 85-95 outside, and then you want 76 when it's more than 95 outside.

    Since feeling comfortablly cool is a relative concept, put your thermostat at 82 when it's over 95 outside - and you'll see how well your A/C might perform. Also, make sure your filter is clean.

  6. #6
    Join Date
    May 2012
    Posts
    137

    Default Re: whats the problem

    Ridiculous...here in Central Florida, it's common to have 70-72 degree temp in 99 degree, humid weather.

    Call your installer and demand a fix.

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