I am talking winter nights where it is always below freezing, and generally between 0°F and 20°F. Many factors lead to having to conserve the battery, and use minimal heat: Always boondocking without shore power, camped and not running the engine while driving, snow covering the solar panel, cloudy days w/o much solar input, weak battery at such low temps, etc. Truth is when it is so cold we rarely raise the penthouse, as the van is so much colder that way. But not all memory foam is the same, so some of it may work OK at higher temps. Good luck.
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2010 E-350 4x4 Sportsmobile "Moby" for the backroads
2109 Sprinter Pleasure-Way XLTS "Pequod" for the highways
www.mobygoes.com
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