For the cheap price of RV antifreeze - and the even cheaper price of compressed air - and knowing Murphy lives everywhere (crap happens) - I would still winterize the plumbing...
Avoids any worry of freezing if there is an extended power/heating failure... and avoids having to run a propane furnace venting into an enclosed building...
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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