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Aesthetically pleasing as they may be, windows are typically a drain on a building’s energy efficiency. Enter This post is sponsored by PG&E (the Pacific Gas and Electric Company) as part of their wider focus on fighting climate change. As always, Springwise is adamant about maintaining editorial objectivity—PG&E asked us to write about energy conservation, but had no further involvement in the content of this or other posts. Check out PG&E’s We Can Do This website for more, including a feature on the Sierra Nevada Brewing Co., a sustainable brewery.