MEXICOWANDERER wrote:
Naio, in 1976 I went on a binge. Yanked the seat out of my 1970 chevy pickup. Padded the floor with closed loop nylon carpet. Drilled holes in the overhead and fill it with aerosol foam. Took the doors apart and laid 1" insulation on the inside of the exterior sheet metal then that sticky brown sound absorber factory stuff on the inside of the interior door sheet metal. An upholstery shop redid the seat. Carpet was glued to the behind the seat gas tank which was removed and insulation stuffed on the rear cab wall.
The difference was astonishing. We had days of 0F fog and before the defroster kept a dinner plate size hole of the windshield defrosted, afterward in even colder weather not only was the whole windshield defrosted but I had to turn the heat down.
The truck was quieter than my 67 caddy. I could park in subzero F and the truck would take 20 minutes to cool down in the cab. Summer 100F temperatures were throttled by cutout shades on the windows when parked in the sun.
All this made a lasting impression on me.
David ... your comments above and by some others (i.e. Naio) in this thread touch on something I have noticed in our small Class C. So far in any cool temperatures we have camped in - with no heat turned on at all - just the body heat from us two adults and one 8 lb. dog seems to be able to always keep the interior of our RV 10-12 degrees above the outside temperature. (How many BTUs per hour does an adult human body put out, anyway?)
So insulation combined with small interior volume can indeed conserve heat well. I'll bet an RV with 6 inch thick walls and 12 inch thick ceilings - all filled to the brim with insulation - could stay real comfortable with way less BTU help than current RVs require from their furnaces and air conditioners.
FWIW, I stand by my assertion earlier in this thread that living in and RV - not traveling, but living - could be way less of an energy hog than a 1000 sf on-up stick house with all it's appliances and other modern energy powered trappings. Unless of course that "house" consisted of a 1000 sf on-up cave. ;)