The Formula for Energy Efficiency in Windows

Shedding some light on windows that adjust to outdoor conditions

The formula for energy efficiency is not easy to figure. A primary way to cut down on the electricity costs associated with artificial lighting, for example, is to include more daylighting in the plan. More windows, however, means more solar heat gain and less insulative value, even in this era of triple-paned units and low-E coatings. (Also confusing: Solar heat gain is, sometimes, desirable.)

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