Tina said it well. It shouldn't hurthim, not just for an hour...i have taken rabbits to 4H meetings andstuff from outside in the winter and theyre ok...just have to keep allthe cloverbuds (under age 9) from sufficating them... but if thetemperature difference is so drastic it would kill him--well that justwould be hard to happen this time of year! but if he was running aroundin your house and got reallyworked upit might givehim heat stroke,