I did -11*F last winter and was toasty warm. The best trick I have found for these frigid temps is a garlington insulator. It acts as a weathershield too.
My setup from last winter:
claytor hammock
8x10 siltarp set up as a baker's hut to block the 15-20mph winds off the reservoir
-20*TNF down bag
walmart ccf (egg crate one)
walmart 3/8 in ccf
truck sunshade
2 garbage bags filled w/air ala garlington
poncho rigged as garlington insulator
I was so warm in this, I know I could have gone way lower.
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