In cooling climates, where should low E coatings be installed on windows?

In cooling climates, low-emissivity (low E) coatings are designed to reflect heat away from the building while allowing visible light to enter. When installed on the interior surface of the outside glazing pane, these coatings effectively reduce solar heat gain from outside during hot weather, keeping the interior cooler and reducing air conditioning demands.

This placement maximizes the benefits of low E coatings, as they can reflect the sun's radiant heat without obstructing light. By preventing heat from entering through the window, it contributes to overall energy efficiency in climates where cooling is a primary concern.

Other placements, such as on the interior surface of the inside glazing pane or on the exterior of the window, wouldn't provide the same level of efficiency in a cooling climate. For instance, placing the coating on the interior side would not effectively block the heat before it enters the indoor space, which is the primary goal in a cooling scenario.