Baltimore, MD- EFynch.com:Windows are one of the most overlooked energy monsters in your home. Although great advances have been made with increasing insulation value (yes, insulation is equally important for HOT as it is for COLD), the hot summer sun pummels your windows all day long.
That heat literally turns anything it touches into a radiator which can cause your AC to run constantly as some indoor surfaces can top 130 degrees Fahrenheit!
To battle this, a few years ago I spent time studying Passive Solar. The idea is you design your home to block out the summer sun but let it in during the winter (has to do with shutters and angles, besides the point). In this practice you use certain finishes in your home to capture the right heat .etc. etc.etc. . This is great but, it requires work and planning.
If you are looking for changes that can have an effect right away- tomorrow- literally.