I bring it in every night after work and take it back out to my truck in the morning. I'm a pipe fitter, so I don't have the luxury of going into an office every day. If I had an inside job, then I would just take it into work with me. I try to keep the batteries warm if possible, but sometimes I can't. I notice the batteries really take a hit under 20 degrees F, but I've never had a problem. I used to miss too many birds not bringing it, so that's why I made the decision to always have it!
Jeremy