Russ,
As you've seen from some of the comments already, styrene kits shouldn't be a problem. However, ANY resin kits or large resin parts (bodies, interiors, frames, large flat pieces, etc.) need to be stored inside the house where they won't get as hot as your carport will get. The heat will warp resin, but styrene seems to survive just fine.
Be sure to look us up when you get here!