Monitor the forecast before you come. Some years its below freezing for lows. some it mid 30's. If you have ducted heat to the holding tank area's, I'd say your good to the mid twenties as long as you run your furnace. Some run a little ceramic heater in the compartment to supplement the furnace ducted heat. If it's going to be below mid twenties, I'd winterize and not hook up water. Leaving the cabinet doors of area's with water lines open inside will allow the temps in the camper to prevent the inside plumbing from freezing.