building my new reptile room in freezing conditions ..

Ok so i live in switzerland and wanted to know if there is anybody here that could give me advice on insulating against the cold temps of winter i have to deal with. The barn is 30ft x20ft and has no insulation at all.

if you have pics or suggestions please say as i will start building it in about 3 months or so thanks..

http://i613.photobucket.com/albums/t...l/RLW_7372.jpg

Double insulation, and a good heater.

ok and what about fresh air
when its comin in at around 12 deg F. or -11c
if i close it up completely it will get muffy with loads of reptiles in there.

crack a window