According to the article:  What Architects Need to Know About Window Films, the following information was received:

 

“Global energy conservation is one major benefit. According to the World Business Council for Sustainable Development (WBCSD), 40 percent of global energy is consumed by commercial buildings. Roughly one-third of the power consumption of a commercial building is due to excess load placed on HVAC systems from solar heat gain (SHG).

High-efficiency window films can reduce SHG by 50-75 percent, often without requiring a drastic change in aesthetics from either the interior or exterior view. Window films help manage SHG by controlling the transmission, absorption and reflection of solar energy.” —Niziolek

 

Just another GREAT reason to use window film.  The money saved by companies can be used to increase their business in other areas