At 28 to 30 degrees you will never haft to worry. I stayed in them when it was down in the teens, no problem for a night when it gets warm during the day. I been in them when water froze in the sink at night without hurting a thing except me when I had to get up and warm up the camper. When we are on Union Pass in Wyoming at 9200 feet the nights will always be that cold. Don't worry.
Lynwood
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