Patrick, I'll be very interested to see the temperatures you come up with. I need to decide if heat strips would be right for my rig, or whether antifreeze will do the job.
Alan, regarding your comments, my 200 gallons of fresh water is under the bed, so it's esentially inside the motorhome which will be warm. The tanks I'm interested in are the gray and black water tanks and their drain pipes which are exposed to the outside weather.
As far as window, my feeling is that it's a cost trade-off in that for an additional $1000 for thermal pane glass you get a slightly higher R-value and slightly less noise. I chose the standard windows.
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