How do you survive subZERO temperatures while living in your van? How do to stay warm in a van during winter? In the great white north, it is not uncommon for temperatures to drop below zero degrees fahrenheit during extreme winter conditions. The winter season is the most crucial time of year when it comes to survival while living in your van. Survivng a winter storm and arctic temperatures becomes dependent how prepared you are for these circumstances. In this video I explain the methods I use to stay warm in my van. My Chinese diesel heater from Amazon is a key component when it comes to staying warm when temps drop well below freezing temperatures.