In your southern winter, I might recommend wrapping in black tar paper to get a little solar gain. I would think moisture is your greatest problem. Some mountain camp sugar on the top bars would absorb that moisture and provide supplemental feed. I really hate starvation. Sure the bees will haul some of it away but I doubt it will seriously impact your bottom line.
My only winter opening/vent is a one inch hole bored right below the handhold on the uppermost hive bodies. Bees are masters of HVAC and a single opening is what they naturally choose. Good luck.
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