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Winterize period, IMHO. I may winterize 2-3 times a year. At 3 bucks a gallon I winterize. When it only takes 30-60 min. to do the work with an air compressor and pick up hose I choose not to risk it. We are in the foothills of the Somkey Mountains it was 31 here this morning. Now I have left the furnace on the lowest setting before also in between trips, afterblowing out the lines.
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