We camped in Custer State Park in May of 11. COLD..... got to the single digit range at night and only into the 30's during the day. Our furnace was not working, but we did not have any cold drafts from the velcro seams. We did have a portable ceramic heater that kept us nice and comfy at night. Furnace had a bad mother board that was replaced by the dealer when we got home.
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