Well written article about low-e window film at grist.org.
The author sidesteps the issue of endorsing the film on home improvement stores in the original question. Low-E film is a very specific type of window film. It is best to purchase it from a reputable brand like SolarGard, Llumar, SunTek, etc… rather than using the non-professional brands from home improvement stores.
The article also states:
Low-e films should last about 10-15 years, can save you up to 10 percent of