This document promotes window films from Environmental Control Films that can help reduce energy consumption in commercial buildings. It states that over 30% of heat builds up through glass and these films selectively filter solar energy, blocking UV rays and lessening heat build up. Case studies show installations reducing annual HVAC expenditures by 10-18% with payback periods of 1.9-3.1 years. The document argues that upgrading windows with these solar control films provides both energy savings and other benefits like protecting interiors from UV damage.