I plug ours into a 20 amp anytime I am working on it in the driveway. I have been known to run the AC and/or heat pump without any problems. That said, if it is really hot, the AC will draw enough to trip the house breaker for the circuit.
Where we store our unit, there are 15 amp outlets, and most of us plug in with an adapter in order to keep the batteries charged.
Craig and Carol
1997 34' Excella 1000
1970 27' Overlander, International
2009 Ford F150 5.4L
ProPride hitch with 1400# bars
Past President Southeastern Camping Unit (12)