Not just the faucets freezing but I have seen the drains freeze as well. Little rock salt every now and then. And do not go off for 2 weeks with water running. Get a drain on lowest part of water line. Blow lines out with air and put antifreeze in all p traps and toilet. Do not trust power to stay on or oil burner to keep running. If you can change all pipes to Pex. The fun don't start when the pipes are froze, it starts when you thaw them out.