3-Ton Unit Efficiency
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  1. #1

    3-Ton Unit Efficiency

    I am wondering if my unit is doing all that it can do. After we added on to the house, it seems like its more difficult for the house to cool off. The unit is a Armstrong 3-ton about 12 years old. Today, I done a little checking. It was 84 degrees outside. The humidity was probably about 60%. I measured the temp at the register that was the most distance from the unit and it was 64 degrees with 90% humidity. The air at the closest register was the same. The air at the return was 73 degrees at 60% humidity. That's only a 9 degree difference. Also, is there a simple way to check to see if my air flow is sufficient. Any ideas would certainly be appreciated.

  2. #2
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    This is not a DIY site, but I can tell you that when you add more load to a system, that system works harder.

    Check for insulation problems on the ducting that runs through unconditioned areas. Check you air filter. That's about it for HO testing.
    Government is a disease...
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  3. #3
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    Measuring temps at the registers seldom tells you anything.

    Have a service tech check it.
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    How many times must one fix something before it is fixed?

  4. #4
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    Quote Originally Posted by beenthere View Post
    Measuring temps at the registers seldom tells you anything.

    Have a service tech check it.
    Wrong. Service dude. Or did you forget?

  5. #5
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    Quote Originally Posted by the dangling wrangler View Post
    Wrong. Service dude. Or did you forget?
    So, you have something against service dudettes?
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  6. #6
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    Quote Originally Posted by the dangling wrangler View Post
    Wrong. Service dude. Or did you forget?
    Nope. I saw that they closed the other thread though.
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  7. #7
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    Hmm Uncomfortable

    Sounds like you added on, and robbed your other supply's for air.Big no,no Your system was'nt designed to handle the addition. 12 years ago, yeah today ,no. Sorry man you need a bigger system.

  8. #8
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    Jun 2008
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    west point, ga.
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    Who done your duct work to your addition?

  9. #9
    The original duct is insulated metal duct, but the extension from the original placement of the unit to where it is now is flexible insulated tubing. The house is 2-story with a separate system for the upper floor. The bottom story sq footage is about 1600sq ft., but a lot of the spaze is open except for the great room which has 18ft cathedral ceilings with the ceiling fans. I would have thought that a 3-ton unit would have been sufficent, but my air flow doesn't seem all that great.

  10. #10
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    Quote Originally Posted by RoBoTeq View Post
    So, you have something against service dudettes?
    Why no. My wife just happens to be a service dudette. Not too bad, if I do say so myself.

  11. #11
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    Quote Originally Posted by beenthere View Post
    Nope. I saw that they closed the other thread though.
    Yep. And there wasn't even any in fighting. Go figure.

  12. #12
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    was the system running the duringthe remodel

  13. #13
    Join Date
    Jul 2008
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    Quote Originally Posted by dbdezyne View Post
    I am wondering if my unit is doing all that it can do. After we added on to the house, it seems like its more difficult for the house to cool off. The unit is a Armstrong 3-ton about 12 years old. Today, I done a little checking. It was 84 degrees outside. The humidity was probably about 60%. I measured the temp at the register that was the most distance from the unit and it was 64 degrees with 90% humidity. The air at the closest register was the same. The air at the return was 73 degrees at 60% humidity. That's only a 9 degree difference. Also, is there a simple way to check to see if my air flow is sufficient. Any ideas would certainly be appreciated.
    Sounds like it could be better,time to get it service,could save money on electric bill

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