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Old 01-27-15, 02:44 AM   #4
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Join Date: Jul 2014
Location: Austin, TX
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I second the mini hrv. Its not the R-value you need a heat conductor under your bed to move your heat. An aluminum channel recessed in the floor with an opening to the interior on one end and exterior on the other might be all you need. Put the fresh air side by your head and you lungs can be the fan. The computer fan might move too much air. If you move too much air under you it might make a cold spot. Judging by the snow in your pics you camp in a much colder environment then I do. I use a US military bag rated for 0 degrees. Works great on the ground in an open tent, its kept my snug down to the 20s. Sleeping in thermals makes a world of difference.
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