Chattanooga, TN - wet slip - usually only deal with a handful of days below freezing. Drain and blow air through all the fresh water systems. Add antifreeze to drains and shower sump. Drain and clean the poop tank and add antifreeze. Engine, Generator and HVAC I don't winterize unless the boat is going to be out of the water for maintenance. Bilge heater - 40-45 deg. Portable electric heater in the cabin. 45 deg. Monitor by phone app. If power goes out I have a friend in the area with keys that can crank up the generator. One thing really nice about the Chickamauga Marina it's one of the first customers from a TVA sub station.