When I put an addition on my home in 1999, I used Harvey Windows which allegedly were all "E-glass". I had some rather expensive pleated shades put on all the windows with the exception of an eliptical window that was directly above a triple mullion window I had in the front of the addition. Needless to say, this window faced the west and the summer sun would stream inside with great strength. It only took about a year before one of my pieces of furniture started to be effected by obvious fading. The victim was an expensive chair.
At that time I decided to have the window tinted to prevent further sun damage. I contracted a tinting firm who came out, washed the inside window three times to make sure there was no streaks or foreign matter on the surface of the glass, and then applied a tinted film over the inside surface of the glass. The end result was wonderful! From the exterior of my home, the eliptical window had a mirror-like reflection, while from inside you could see out to the sky and the neighboring trees.
All was well until the window developed a long crack about six months later. The window company agreed to warranty the window and replace if for free. I asked them if they sold a tinted version of this window. They did and it cost me about $200 extra to have a tinted window put in. It was a good investment because tint films applied over the interior surface of the glass only last so long. My new window had the tint applied inside the glass. That will last forever.
Many people have their car windows tinted beyond what the manufacturers do when the car is built. In some states this is illegal once the tint gets to be too dark. It is not that expensive to have your windows tinted. You can usually tell who spent the money for the good stuff as compared to cheap jobs. If you see bubbling, wrinkles, scratches, or open seams, you can be sure it was a cheap job. For the greatest satisfaction, leave it to the professional tint people.
Bob