Is your washer a top loader? Just disconnect the water supply hoses and call it good enough. I've left a used top loader washer in unheated storage and they work fine when reconnected.
If you have a front loader, they don't pump all of the gray water out so there is likely water in the pump and freezing would cause damage. I'd open the door and point the heater at the inside of the washer with the door open. Hot air circulating inside and around it will keep it from freezing even if the room goes below freezing.
Top but the water lines have to run under the porch, Not worried about interior so much. I wasnt here when this was done so not sure how.
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....
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