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Everyone loves light and glass in a home. Sweeping views and good daylighting sell homes. Conversely, a dark, windowless space is a big turnoff. But if a little glass is good, more glass is not always better. In their enthusiasm to brighten a space, capture solar gains or open up a view, designers often use too much glass. People always are surprised by how much discomfort a large bank of glass can bring. Too much glass in the wrong places can lead to overheating in spring, summer, and fall, and to cold drafts and cold home owners in winter. Furthermore, if the plan is not wellthought- out, the light can be harsh, glaring or blinding at times—making