electric at the tent sites is $2 more, and at your temps, that is cheap...electric heater....and a vent on the roof of the tent to let out the evaporated moisture produced from your breathing all nite, which leads to condensation inside the tent. not to mention the moisture in the air.
no electric? whewww hard to camp in the freezin azzz cold...much less get up in the morning and get dressed to go hunt..its a real downer...
we do it every year in 20-60f degree weather...and those 20's and 30's were tough..but after the electric heater, it was very comfortable..