In our bigfoot 1500 we updated our thermostat to be able to be sat at 50 degrees, if it’s under 30degrees we open the hatches and doors and will use a Mr Heater Buddy to help raise the temps. Our rig is well insulated but it’s not four season insulated. Keeping the inside at around 50degrees keeps most of the cold at bay. We can’t camp when it’s below 29degrees, it is just a lost battle with the outside air.
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