In the case of external windows and glazed doors, with careful attention to glass specifiers can reduce heat losses, by choosing, for example, double or triple-glazed units and low-e coatings. Solar gain, discomfort and debilitating glare can also be limited through glass specification and balanced against the quantity and quality of daylight penetration which can lower the costs and other impacts of artificial lighting. Brise soleil also have an impact on solar gain and glare, but need to be balanced against reductions in beneficial thermal gain and daylight. Detailed construction and workmanship also has a big impact on heat loss, for example through cold bridges and air leakage.
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