If you don't have 50amp service (and an RV that has 50 amp service) you most likely will blow a circuit breaker. Yes, I have run an extension cord directly from the 110 outlet and that will work, make sure it's heavy duty. If you notice the cord getting hot, you may not be able to continue the use! Finally got an RV with 50 amp service so i can run the air while blowdrying my hair! Used to drive hubby nuts! Can't wait, heading to the Fort Saturday AM! be there by 1PM check-in! Have to see about printing my own sign, since i don't have time to order one!