I'm a Full Time RVer living in a 1993 Class C RV - even in the winter! There is zero insulation and it's drafty. Here is how I winterize the inside of my RV to stay warm when it's freezing outside, what I use for heat, how I prevent my pipes from freezing and how I flush my toilet when the water is frozen! To Read More winter RV Insulating tips, check out the blog! www.carolynsrvlife.com/2016/12/11/how-to-stay-warm-in-your-rv-in-the-winter/ UPDATE: IF YOUR FRESH WATER TANK IS INSIDE THE CABIN YOU CAN PREVENT IT FROM FREEZING BY HEATING YOUR WHOLE RV AT NIGHT. MINE FROZE WHEN I BLOCKED OFF THE MAIN CABIN AND ONLY HEATED MY BEDROOM! My friend Bob Wells of CheapRVLiving.com makes a guest appearance and does the wonderful camera work for me! For more stories about my RV Life visit: CarolynsRVLife.com. I also have RV buying tips, Boondocking locations and more!