Not exactly Galactus, but I've been pretty conscious of temp in my apartment this year and when I go out of town I leave it at 78 just to prevent coming home to everyone on the floor. I think it's ridiculous that I air condition for action figures, but c'est la vie. Even still, different collections wilt at different degrees.
On the Galactic front, I have never gotten Galactus to stand up on his own for very long no matter the temp - if he's not propped up or leaning, he's going to fall over. VERY frustrating.
This is why I want the popcorn bucket - try toppling that thing!