My GSDs like to be outside ONLY if someone is with them to play!!! When I go in, they want to come in too. They like to be where the family is. I'm with aly, to heat the doghouse, all I have to do is turn up the thermostat!! LOL
BTW, we DID have a doghouse, just in case one wanted to use it, but....it ended up that we used it for storing gardening tools. Later, we just used it for a bon-fire! It looked nice, though. hahaha