I actually think it will be ok, it was the last time. And yes it has skirting but the gaps between the deck boards....
You can drive some of the warmer air from the porch through those cracks if you lay a 20" box fan face down on the deck. It won't be a lot of air but it will be warmer and keep it circulating. If you could pull up a plank you could blow more air into the underporch area. How cold is it supposed to get where you are? Do you have a spare thermometer you could leave in the room to monitor the temperature/know when it needs more heat?
Not that fuckin cold, we are in Tx sub after all. Maybe like 10 or 12 f.
I was estimating 15F to 20F worst case for you. That's a nice winter daytime temp where I live. I deal with an occasional short stretch of -25F here. Everything is insulated with exterior faucets shut off and drained.
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