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.
I would actually like to try that once, as long as I was prepared for it. I kinda envy you.
They are currently saying 15 but thats in town.
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