Based on the info you have dual pane windows, heated water bay and heated water tanks, good insulation in walls, floor and ceiling. You're good to go! Your biggest heat loss will come from your windshield and the entry door window. Why National put in dual pane windows and a single pane door window is a mystery. Another big way cold air gets into the MH is through the dash A/C system. On ours if you don't turn the A/C knob to off, the vents stay open and allow cold air to enter in the winter or hot air in the summer.
By the way the bays and water tanks only get heat if you use the furnace, not the heat pumps or electric plug in heaters.
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Steve & Jeri
2004 Dolphin 5342
2000 Jeep Cherokee 4X4
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