We've had both our HTT and TT plugged in and using the A/C at home for over 8 years with no problem...20 amp. Wouldn't try to use the microwave or other appliances with that hookup, but it keeps Rocky nice and cool to go out and take care of some small jobs or just enjoy a quiet moment. We bought an extension cord of whatever size is on the trailer - think it's a 50' one. Wasn't inexpensive but it does the job + we do camp at a SP in KY that has the utilities between the sites and way too far for the standard cord, so we just take the extension along.....when we remember. Nice CG - they have extensions that they let you just borrow if needed.