Mark,
I run mine on 20A from the house all the time. I just use the adapter to 30A, than another to 20A. It is barely enought to run the AC.
I had a 100' cord on a reel for the yard and used it to plug in the monty. It overheated because it was coiled and the heat couldn't escape, and it took nearly 3 hours for that cord to quit burning once I threw it in the grass
. Moral of the story - I bought a heftier cord at Home depot to get the full 20A benefit.