So the pipes under the porch are the real concern.
Can you seal around the base of the porch to the ground to create a dead air space? Hay bales, blue tarp, anything. Then set the heater under the porch pointed at the pipes to warm the dead air space?
Other alternative, can you shut off the supply lines to the porch and drain the porch pipes? No laundry gets done until warmer weather ...
If you can't do either of the above, leave the water running (fast drip or trickle if it gets really cold) might be the best/easiest solution.
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.
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