If you are no electrician and are asking this question I hope you have had your work inspected by qualified electrician. Your insurance company would be concerned.
Jeff, actually a 20 amp outlet is NOT a requirement on a 20 A circuit (unless it's the only outlet on the circuit -- then it needs to be 20 A).
But I agree that for all practical purposes, if you're running a 20 amp circuit, you might as well be able to have items with a 20 amp plug be able to plug into it.
So if you have a conditioner such as a Shunyata hydra which requires a 20 amp plug , you would need a 20 amp receptacle as well ? , not a 15 amp receptacle
The wires have to be rated for 20A which means they would be 12 guage (bigger for long runs) instead of the usual 14, all the way back to the panel. You shouldn't just replace a 15A breaker with a 20A breaker.
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