eu3000 worked great this weekend at around 8000 ft. The only problem I would have is if the air conditioning was running for a while when it would start cycling on and off it would bog down the gen sometimes and not want to start back up. This is on the Eco mode. If it was on full speed mode it wouldn't do that at all. I could run my fridge, tv/dvd, fan, lights and air conditioning all at the same time and it's really quite. I couldn't run the microwave and air conditioning at the same time. Very impressed with this gen. Bad news is some punk kids stole my 5lb gas can :rolleye:. I had enough gas in it to last the rest of the time. I need to buy some chains and locks I guess.