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Discussion Starter · #1 · (Edited)
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.
 

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

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

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

When your indoor temp is 80°F dry bulb and 67°F wet bulb with an outdoor temp of 75°F, 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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