Can Window Film be Used on Low E Windows?

Low E glass has a special coating that reduces ultraviolet and infrared light from passing through its glass. Find out how adding window film can give it even more benefits.

Transcript:

Can window film be used on Low E windows?

You’re probably aware that Low-Emissivity, or Low E glass, is glass with a special coating that reduces the amount of ultraviolet and infrared light that passes through the glass – without compromising the visible light that’s transmitted. So, if a window is labeled Low E glass, does window film give it added benefits?

The Madico U answer is – yes … in most cases.

Whether window film should be used on Low E windows and how much you benefit depends on three factors: the type of Low E surface; the location of the Low E surface on the window; and the amount of heat gain reduction, heat loss reduction, or other window film benefits that your customer is looking for.
Basically, there are two types of Low E surfaces on glass: one is a conductive coating that’s put on the glass as it’s being made. This kind offers some heat loss reduction but doesn’t do much to reduce heat gain into a building.

The second type is a more complex system of multiple layers of metals and conductive coatings deposited on the glass after it has been made. This type of Low E glass gives heat reductions of 30% to 50% in addition to reducing heat loss.

Obviously, there will be more heat gain reduction using film on the first type of Low E glass. If there is any question about the type you may have, ask your glass company or the window manufacturer to send you the specific information about your glass.

Where the Low E surface is located on the window system will also play a role on whether to use window film or not.

If the Low E coating is on the innermost room-side of the window pane, installing window film may cut down or eliminate heat loss reduction on the glass.

However, most Low E window systems are made of double pane windows and the Low E surface is located in the space between the panes. With this type, film can be installed without eliminating the benefit of heat loss reduction of Low E glass.

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