A couple of weeks ago I took my first real trip with the new camper to Acadia Nat'l. Park. In the downpours, I learned that the camper doesn't leak, and that it keeps me perfectly dry, as well as absolutely frozen in the cold rain and wind. When we placed our order, to save space we decided against the furnace and opted instead for the air conditioner. After four nights, on the trip home, I stopped at a marine supply and grabbed a pair of Weems and Plath gimballed oil lamps. When I owned a wooden boat, these lamps were all that was needed to take the chill off a similarly sized, but uninsulated space. I haven't been able to try these out in circumstances similar to the conditions at Acadia, but I am sure they will do the trick. They won't make the cabin stuffy, but I am certain they will make the living arrangements much more comfortable.
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