If you have a main water shutoff valve, you can protect your pipes from bursting, south or north, it doesn't matter. Turn off your water where it enters the home, open the highest and lowest faucets in the house, some water will drain out at the lowest one. The pressure has now been released in the pipes and air introduced. If the remaining water freezes, it now has somewhere to expand to and your pipes wont burse. I do this every year at my place in Ocean City incase power goes off during a cold spell. Flushing the toilet one last time is a good idea also to empty the tank.