Have you ever stood in a window to feel the warm sun coming in? Most of that sunlight becomes heat (technically called “heat gain.”). The average American pays around $300 a year to keep their home cool (unless you live in the South!). We cut down on costs (and heat) the easy way- by closing our blinds and curtains on the sunny side of the house. Want to go big? Plant a deciduous tree outside. It will shade your house in the summer and let the sun shine in during the winter!