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Here in the Dallas metroplex it got to 20 degrees last night. We winterize by draining the hot water heater and blowing out the lines with compressed air. It takes about 5 to 10 minutes(only use antifreeze in the traps). Since we camp ever other weekend in the winter, blowing out the lines is a lot cheaper than antifreeze and I do not have to worry if it does get a little cool.
I think you made the wisest decision.
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