Dang...that’s a big percentage, if the weather was similar both years.
I need something to keep warmth in...but I think the loss through the actual glass is the least of my worries. :-\
Having coffee and pancakes, and then I’m going to do a bunch of reorganizing and reading and writing. And mow the lawn. *sigh*
You could knit a big ol’ sweater for your house...
Lil’ probably has a pattern and a source for vinyl yarn.