We live in Pennsylvania. We leave our house temp. set at 55. We also have the water company come and shut our water off, when we are ready to leave the house. Most home's have a shut off valve away from the main water line. Our's is buried in the ground in our front lawn, next to the main city water line. Once they shut the water off, we drain all our water lines inside the house. For the water company this is a simple proceedure. It takes about 10 minutes total. They have a special tool to locate the shut off valve, and dig about 3 inch round hole to get down to the valve to shut is off. They also put the plug of grass and dirt they dig out back into the ground. It doesn't leave a hole and your yard it not damaged.
Then we leave worry free about pipes freezing. Before we return home, we call and tell them when we will be home, and schedule a turn on time.
I dont know if all water company's do this but, it really helps us.
ljane