[QxUOTE=bareftn;1381188]What we have done when we had our popup we used a electric blanket under our sleeping bag to prevent the cold from the bunk[/QUOTE]
We love winter camping, too. Don't go near as much as we would like. Anyway, all great ideas. We do the reflectix in windows and gizmos on top of canvas. I also cut and taped reflectix and placed under the mattresses. It helps against heat loss when we use the heated mattresses. Furnace set at 55 and use an electric heater. I Don't use the propane heater inside. I know, ones like mr buddy and such, are supposed to be safe, and a ton of people use them, but I can't do it. I dated a girl years ago, and her brother and finance died after using a propane heater inside their tent of carbon monoxide poisoning.(no idea what heater they used). Anyway, I won't take that chance with my family.
As others have said just use some common sense, and crack the vents a bit, and you will be fine. Enjoy.
2015 FR Classic 625D
2011 Toyota Sienna XLE