Abstract
ABSTRACT Building owners and property managers have provided numerous reports of the energy savings obtained from the retrofit installation of energy control window film to existing buildings. In many cases, substantial energy savings are reported with simple paybacks often within one to four years. However, such claims have not been produced using the rigorous methods prescribed by the International Performance Measurement and Verification Protocol (IPMVP, see www.ipmvp.org). To provide for more definitive evidence of the savings from the use of energy control window films, CPFilms undertook a demonstration project to install window film on a mid-size commercial office building and then measure the resulting energy savings using two separate IPMVP methods. The measurement of savings involved the use of IPMVP Option C (whole-building method using utility bill analysis) and Option D (calibrated simulation). During the twelve months following film installation, Option C measured savings of 8.8 percent were achieved, which includes savings over both the cooling and heating seasons. This compares favorably to Option D, calculated savings of 8.4 percent that were estimated prior to film installation. Both estimates of energy savings demonstrate a simple payback in less than three years.
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