A professor engineered “cooling paper” to sustainably control indoor temperatures.. The paper reflects heat away from rooftops and sucks heat out of buildings; can cool a room's temperature as much as 10 degrees Fahrenheit - a game-changing alternative to air conditioners.. Invention works through "porous microstructure of the natural fibers" inside the cooling paper, absorbs warmth and reemits it away from the building. The cooling paper itself is made out of common paper..