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Old 05-01-2011, 05:09 PM   #1
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Curiosity, How much oversizing till it's 'felt'


This is just a question of curiosity, I understand the importance of sizing ac tons correctly for your home, but how big is too big to label it ' over sized ' and you actually start feeling the hurt with your air quality and short cycling?

Half ton over?
1 ton over ?

if a house is calling for 2.5 tons on a manual J calc, and a 3 ton is installed for example.... I mean, it's only a measly 6000 btu's right?
Just trying to ease my curiosity of how much is toooo much.

Thanks.


Last edited by alecmcmahon; 05-01-2011 at 05:11 PM.
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Old 05-01-2011, 05:50 PM   #2
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Curiosity, How much oversizing till it's 'felt'


1/2 ton will do it. Causes shorter cycles and less dehumidification.

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Old 05-01-2011, 07:26 PM   #3
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Curiosity, How much oversizing till it's 'felt'


A half ton larger unit. When the indoor temp is 80F dry bulb and 67F wet bulb with the outdoor temp at 95F, its only a measly 6000 btu's.

When your indoor temp is 80F dry bulb and 67F wet bulb with an outdoor temp of 85F, its about 16,000 BTUs over sized.

When your indoor temp is 80F dry bulb and 67F wet bulb with an outdoor temp of 75F, its about 28,000 BTUs over sized.

An over sized unit will cause most people to have to set the thermostat to a lower temp ( 2 to 4 degrees lower ) to feel as comfortable as they would why a properly sized unit using far more electric.
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