Too complicated
Way too much detail. Been in the same camp for 60+ years. A cup or two of antifreeze in the toilets, shower, sinks. No need to drain 100%, it will mix and still be good to 30 below. Don't have a dishwasher, or heat to leave on low. In recent years we added a clothes washer. Never did anything to winterize it, maybe a cup of antifreeze, maybe not. We drain pipes but don't pump antifreeze through the entire system, which was designed and built for easy drain.
I'm more concerned about coming back in the spring ad finding a tree in the living room than I am about frozen pipes, but no good defense for that.
For the last several years, we''ve hired opening and closing. Again, no problems. Feeling is, if they mess up in the fall, they'll fix it in the spring. Easy-peasey. And they'll watch it over the winter, something I simply cannot do.
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