More Solar Gain, Not R-Value, Better for Heating Climates

The articles fail to mention, however, that windows are not only a source of heat loss but also a source of heat gain. In the north, the best insulating value doesn’t necessarily result in the lowest heating bill. The featured windows employ one or more highly insulating, low-solar-gain low-emissivity coatings. While this is a great choice for cooling climates, it blocks the free heat from the sun in heating climates.

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