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Old 08-22-2020, 11:26 PM   #1
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What about oversizing an AC that has a variable motor?


I think I know the main reasons of why not to usually oversize on an AC. It won't dehumidify, the condensor won't be on long, and will keep cycling, but what about getting a larger AC condensor if its one of these expensive models with a variable condensor motor.

My sleep schedule just fluctuates and I like to crank it down from 75 to 67 when I do. I especially do this in the summer time when its 110+ out and I can accomplish more when its cooler out.

If my house would be sized right for 2 1/2 or 3 ton, and lets say I could get a good deal on a 4 or even 5 ton, would that work?
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Old 08-22-2020, 11:52 PM   #2
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Re: What about oversizing an AC that has a variable motor?


It’ll be very expensive redoing all your ductwork to fit that 5 ton unit you got a “good deal” on.
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Old 08-22-2020, 11:55 PM   #3
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Re: What about oversizing an AC that has a variable motor?


Certainly didn't think of sizing the ductwork. That sounds good enough to kill the deal. Thanks.
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Old 08-23-2020, 07:53 AM   #4
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Re: What about oversizing an AC that has a variable motor?


You could be filling the inside of your walls with mold by having a setpoint that low. The colder your walls are, the higher the chance that outdoor humidity could be attracted to them.


A Variable speed compressor, coupled with a variable speed indoor fan and a communicating thermostat CAN dehumidify better than a standard system, but it's still not good to oversize, and the thing about the ductwork is something that many people overlook.
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