I don't know if you ever saw film "up". I really like this film and I watched it at my English lessons ^^
I was amazed that he was able to rise his house only on baloons.
But people from National Geografic proved that it's possible. They build a small house (5x5m) and attached to it over 300 baloons. And it could fly but the baloons have to be full in helium. It raised at 3 km height and was flying there about hour. Impressive isn't it?
I was only imaginating how was it to make my house fly and they did it: