I lived in Florida and moved to Iowa back in 2010. My 4 computerized machines were in storage for 4 years all in Florida. It was supposed to be in an air conditioned unit but as I noticed some plastic such as small kitchen appliances, even my microwave had turned yellow so I know it wasn't A/C'd. Anyway, they made it thru like champs. I have the Viking Designer 1, Babylock Ellegante, Elna 945 and Babylock Evolve and they all work fine.
Also, when they were unloading my stuff, I noticed my Viking D1 down on the bottom of the pile with all those heavy boxes on top. I freaked out but as I had everything in its original boxes, they made it. Other items such as furniture were not so lucky. Had a brand new gas grill that its wheels were ripped off and an antique end table split into 2 among a few items.
Good luck on your move and I agree totally with you, like, not love the cold but hate the heat.
Suz in Iowa