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Hvac Pro
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23,688 Posts
Why do you want to know. There are 12-24 different problems with those and you need to understand the fundamentals of refrigeration to understand them.
 

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Administrator
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41,860 Posts
Thats a bigger question then you realize.

Can you n arrow down the question to what your application is.
 

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Wire Chewer
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3,593 Posts
undersized: will run forever and take very long to cool - inefficient
oversized: will not run long enough, stop right away, only to start again shortly after. So lot of on/off cycles. Also inefficient. Will also never give the coil a chance to collect much water, so the humidity control won't be very good.

I'm sure there is more to it too but that's the jist of it.

I learned about the oversizing factor with my 1 ton AC unit I use in a 70 square foot room. :laughing:
 
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