We are considering wintering in a Florida campground between Gainesville and Ocala. I know the PC is fitted with tank heaters for cold weather, but how low? Average temperatures for the area per AccuWeather.com for January is upper 60s-70° daytime to mid to upper 40s at night. Okay so far, but record lows mostly in the 20s with a couple as low as 10°!! Anyone have experience with this? We have insulated windows.