Trouble cooling in North Dakota? :grin01:
Probably the only way would be to let an entire room or closet get cool enough for brumation. Some people use A/C to get this done. I have read that other people just leave a window open a bit and control the temp that way.
Naturally, if you heat your home in the winter it will be difficult to get the temp down in just the viv. I don't know if there is anyway to possibly get just the viv cooled and nothing else, but it doesn't seem too likely. :shrugs: