Ditto on other replies. Watch leaving your engines in unheated area as well. One year I suspended a couple planes from the ceiling in my garage (due to lack of space). The cooling/heating made enough condensation on the engines to rust a little (just enough to notice in carb barrels). This could cause problems if it gets to the bearings!!

Humidity is my major woe. I can't keep up the humidity in the winter enough to keep my covering from sagging.

You pilots in sunny states don't know how good you have it!

Pilgrim