SpongeBob's New Home

[Arcticdude]

I know I'm resurrecting an old thread, but this should fit it well. Has anybody ever found a door system that will truly seal like a house door for enclosing a bird barn? I'm going to add a parking spot on the side of the house and would like to tie into the house hvac, but I'd like to be able to seal the bird door much better than anything I've seen. Standard garage and roll up doors just don't seal well enough for me. I haven't seen any sliders that seal any better. So what have you found?