Low-E window glass vs Window film

First of all, Low-E window glass is much expensive than window film. Window film costs half or a third of Low-E window glass costs.

Secondly, Low-E glass focuses on insulation in winter. So it could be warmer in summer. Therefore, you will spend more money for cooling cost in summer. However, window film reduces heat in and saves cooling cost in summer. Also, it prevents from air leakage, so it keeps warm air from outside in winter. It leads to save heating cost in winter.

Thirdly, Filink film is made of 100% ceramic which does not allow discoloring, or down-grade of film quality. Window film rejects 99% UV rays which means that furniture or interior stuff will be protected from discoloring or damage from sun.

Last of all, California in the USA add window film into its building code. Also window film is popular in Japan as well, because window film helps hold panes in place to minimize flying glass due to violent weather or accidents. Especially, Japan had lots of damage due to earthquake.

If you want to save both of cooling and heating cost, then install window film at your home, office, and your car. It will give you safety, good looking, and saving money as well. You will return on invest within 3 years.