The world needs a new source of energy, an unspillable source.

For energy conservation I bought some plastic sheeting for the windows?

I got the thick 4mil, does it work better with a space between the window and film? My neighbor puts the film right on the window, does that help? I think a still-air space would work better. How much does it really help, 5%?
Help window loss that is, maybe 50% for that.
I knew the brain power of the engineers would find my forrest!