My labs stay in the house, and as long as you have the room and a good vacuum I would recommend it. My young lab sleeps either between my wife and I or on top of me during the night. The weird thing is that I swear that dog can read my mind, no I'm not crazy. At the very least, I can give her a simple look in the field and it is the same as about 20 gestures and commands. I don't think you get the same kind of bonding when they are outside most of the time, at least that is what I've seen with my hunting partners and their dogs over the years.

PS. Nothing warmer than a lab on a cold night, wow those dogs just naturally run hot. Of course my wife usually hogs the dog when its cold, darn.