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Originally Posted by dstankov
Just look at what happens with a cold beer after a minute out of the refrigerator or a container of warm food placed in the fridge.
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Except that a cold beer can is made out of aluminum: Aluminum transmits heat very efficiently (which is why pots & pans are made out of metal). Fiberglass is an insulator and thus you won't get the inside or outside temperatures "transmitted" across the fiberglass that would cause condensation in the first place.
I would think that even in sub-zero temps the engine compartment will still be heated by the engine and thus you won't get sub-zero temp air going up into the A-pillar. Especially if you close off the end with some fatmat: no airflow going in to introduce any humidity to cause condensation. In addition: if the end is closed off the A-pillar will probably just assume the temp that is inside the cab and thus the gradient across it won't be near freezing anywhere enough to cause condensation.
I'm no expert but my gut is telling me this is no worse an issue than simply camping in cold weather where you get tons of condensation simply because the unit is closed up and everyone's breath introduces humidity in the air (the few time's we've camped in cold weather the windows were dripping wet in the morning due to us & the furnace).
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