Low-E Coatings: Summer vs. Winter

A depiction of how an insulated glass unit (IGU) performs with Low-E coating on surfaces 2 & 3(the glass surfaces that face each other inside the IGU).

For regional cold winter climates, the Low-E coating should be specified on surface #3 in order to contribute to the interior heat retention.

The Low-E coating should be specified on surface #2 in mild warm/hot regional climates in order to reflect back to the exterior radiant heat buildup (the sun).

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