Can't be too neurotic about having pipes freeze while you are away from the house. Water leaks lead to structural damage and mold/mildew issues if not dealt with immediately. A bad mold infestation is very hard and costly to truly eliminate.
When I leave my house for more than a couple of days in the winter, I leave the heat on, but shut off and drain the pipes anyway (a fairly easy process) - that way, should I lose power, I am much less likely to have a pipe issue. BTW, I have an automatic generator at my house and I still don't trust it (guess I am neurotic too).
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