We have not had a problem with cold coming through the mattress. But we rarely camp below the upper 30's.
I use the pool noodles and I modified the upper rear shell to lower shell latch on the curb side to block the cold air flowing in past the seal behind the wardrobe.
In cold weather I set the furnace at the lowest setting, about 55F.
If I have to, I would take along my Eddy Bauer sleeping bags, (back in the 70s when he was an Expedition Outfitter instead of a clothing store) that are rated for 20 below, but I have never used them below 10 above.
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