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| WINDOW FILM: Reduces HVAC Cost, Enhances Indoor Air Quality & Improves Appearance Up to 40% of a building’s cooling requirements are from heat entering windows. As a supplement to HVAC, stopping heat at the windows using window film can reduce air conditioning operating frequency and cost. Window film was invented to reduce temperatures in overheated buildings. Too much solar energy entering windows increased heat, making occupants uncomfortable and air conditioning more expensive to operate. Today we’ve are facing to improve energy conservation and include dealing with stale air, moisture and mold growth, out-gassing of furniture and building components and the impact of such conditions on the productivity and well- being of building occupants. Ironically, many of the measures taken to increase energy efficiency such as “tightening” buildings to reduce both air infiltration and outflow have contributed to negative indoor environmental quality. Adding to the management challenge, sensitivity to preserving historic and community character sometimes conflicts with measures to increase energy conservation and enhance environmental standards. At Stanford University's Encina Hall, about 6,212 square feet of spectrally selective window film was applied in June 2003. Spectrally selective film blocks solar heat while transmitting high levels of natural light. Daily air conditioning (A/C) requirements to remove heat at Encina Hall prior to the film's installation amounted to 665.57 A/C tons at an A/C cost of $66.56 per day. Daily air-conditioning requirements to remove heat with the film installed are 339.44 A/C tons at an A/C cost of $33.94 per day. As a result of the film's installation, Encina Hall is seeing an annual savings in A/C cost of $4,891.95. Source: California Energy Commission |
