[Porsche-O-Phile]

Expand or clean the garage.

Carports only keep the bird poo off the car and the rain (mostly) off you. They do nothing for cold.

You can buy one of those car-tent things for about $200 - I have one temporarily set up for my winter beater just to keep the snow and crap off of it (garage is full of other projects). Yeah, they look a little bit ghetto but they're functional, and for a short-term solution it might be something worth looking at. You can put some heat in them too.

As a longer-term solution there are a number of prefab metal garage buildings you can get for pretty cheap. All you need to do is pour a slab and bam. But I still favor a more integrated/permanent solution that works with the other buildings you've got. Those prefab things aren't bad but can look ugly if you get the wrong one.