We "freeze" our corn every winter. Started early this a.m (9 degrees). Will run fans again when it's 0 or below this winter. We never warm it back up. Kind of fun scooping bins out in Jun-July when the corn is 40 degrees & it's 85 out. Augers sweat like mad. Never had a problem, but life isn't over yet. Probably done it this way 20+ yrs.