The Simplest Way to Add Supplemental Solar Heat to Your South-Facing Room in Winter: Testing Solar Thermal Effect of Air Filter and Window Curtains After Being Painted Black

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The title explains everything. I give the links to the air filter and paint I used below.

I used this air filter made of fiber glass that I bought from HomeDepot (production link provided):

I spayed both the air filter and hanging curtains black using Rust-Oleum High Heat Paint that you can purchase almost from any paint store: