not ever had to deal with such cold to worry about frozen pipes. and no my rig is not cold weather insulated.
it does freeze here but only for hrs. worse couple weeks at a time.(high to mid 20'sF)
but in using compressed air. i would be worried about "bad air". air tanks can get muck ( oil, water, rust) in them that will get out via a air hose. so a good air filter is a must here.
maybe this year i will try cleaning out my water system. if for nothing else than practice.
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