Check out our instructions page with our quick 4 step process and downloadable measuring guide. High temperatures during the summer months can make your air conditioning cost go sky high. Plus no one wants to spend time in a room that is uncomfortably warm and bright. What to do about your skylight then? Quick fact: 220 BTUs of heat and ultraviolet light enter your home per square foot, per hour, though your skylights. The Skylight Solar Shades exterior skylight Solar Shade will reduce that amount to 44 BTUs, or a savings of 80%!