I've found, through small batch testing in wine, and suggest you test a glass or two as well, that xylitol and other sweetners weren't as good as backsweetning as glycerol. I liked the glycerin better because it added some mouthfeel to my meads and wines and a touch of sweetness. Xylitol and other sugar substitutes tasted "fake" in my meads and wines, and personally I don't mind sugar substitutes in my coffee/diet sodas/food, but in my alcoholic beverages glycerin tested best.
What I am going to tell you isn't a suggestion to do this, but during the month of December I kept my porter out in a 16X16 insulated but unheated outbuilding, and over night temps were in the low/mid twenties, and day time highs were in the 30's and 40's, my porter was in a 6 gallon glass carboy, your results are likely to vary greatly....If you wanted to cold lager your your cider you could do so safely in a plastic brew bucket.
off topic: but I used to make midnight runs out to jerry johnson on Wednesday "school nights," usually get there then find out we forgot out headlights at home, then stumble all the way to springs flicking a lighter every 10 seconds to get a glimpse of trail,,,,usually this was done in the middle of winter as well....god the 90's were awesome!
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