I'm in OP's boat, also doing this for the first time. I will turn of main water valve, and have someone drain and blow out the water lines. they will drain the hot water tank. They will put antifreeze in the traps. We will set the thermostats for 50F. Someone will be checking the house weekly.
We live on a lake in NY State, and I'd estimate 80% of the places on the lake close up for the winter, and this is pretty standard practice around here, and lots of folks available who know how to do this.
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