Seriously though..best to close off the house and heat one room. That
can be done easily enough in a myriad of ways.


Yup. I nailed blankets over a wide doorway in the early 1980's to cut
down
my heat bill in eastern SoDak. It helped a lot.


Maybe more efficient to use "space blankets"?

Not if I had to buy 'em. In those days the wolf at the door frequently
barged in and ate our dinner. (He hated rice & lentils but he gobbeled them
anyway.) I'm now in the upper __% of income winners world-wide and
history-wide, but the hurt of those early, painful, poor days is aways
present. I *really* appreciate being able to go to the McDonalds drive
through whenever I want, and I recall about 15+ years ago when it first
became possible.

In the days I nailed blankets over the doorway, as the saying goes, "I was
too poor to pay attention."

-- Mark