Really the biggest risk in cold is the risk of water freezing. If you live in an old house that is poorly insulated, pipes in unheated crawl spaces or along outside walls risk freezing and splitting. If you have a sink on an outside wall, simply open the doors under the sink to let the heat in. Run the water once in a while. If you’re just not sure, pay attention to how cold the water comes from the taps around the house including washing machine. If the water is getting near freezing, it’s cheaper to trickle the water than pay for repairs.