It is an old adage that what keeps out the cold, also keeps out the heat.
We purchased our 19 about six years ago.
Because we lived in the Yukon, and we're doing our camping in the Yukon and Alaska, we had double insulation and double glazed windows.
Our first night in our trailer, had an outside temp of minus 10c. When we parked, I turned on the furnace.
We had a glass of wine, undressed and went to bed.
Had a good (warm) sleep got up in the morning and carried on.
No problem, just do not carry fresh water in the tank, or hot water tank.
You can purchase ant-freeze for the black water tank.
Beats sleeping in a tent.
We have since repeated this no problems.
Doug
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