We keep ours in a Building on our Land, works great, we've got a better heating and a/c system than our house in it lol.
Heres a link to our original thread we posted and a few updated pictures.
http://ball-pythons.net/forums/showt...506#post974506
We finished the inside of a wood frame barn with metal siding. This is before anything was done, except concrete prep.

Front

Main Ball Python Room

Incubator

Bearded Dragon Room

It's definatly alot of work but well worth it when you are thinking of the future.