Winterizing - Extreme cold winters

I use air only for the water lines, and antifreeze for the drains. One point - use an oilless compressor or a good oil filter - you don't want oil in the water lines. I blow out the lines at 40PSI one tap at a time, working from the first to last tap in the line. Let it sit for an hour or two, then do it again. Don't forget the toilet & outside shower. Be sure to run the water pump dry, and, of course, drain the water heater. A good time to check/replace the anode.

While this worked for the first 3 years with -10°F winters, I got a much better idea starting 3 years ago - head for Quartzsite, AZ, and forget about winterizing! I'm on my way now...