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Energy Efficiency with Pella Thermal Testing

Efficient windows and doors from Pella can reduce your utility bill and add comfort to your home. We’ve designed our products to deliver exceptional energy efficiency for savings and home comfort year-round.

What Impacts Energy Performance


Low-emissivity (Low-E) glass is a glass coating that improves the energy efficiency of your windows and patio doors. In the winter, Low-E glass reflects heat back into the room, keeping it warmer. In the summer, it reflects heat away from your home, keeping it cooler. Additionally, this glass blocks most of the sun’s harmful UV rays, helping to prevent your carpet, furniture and window treatments from fading.

Air Infiltration

Air infiltration in windows and doors is more commonly referred to as leaks and drafts. This happens in areas with gaps, such as between window sashes or between the window frame and the wall. It can happen because of improper installation, poor manufacturing or as a home settles naturally over the years. To help prevent infiltration, proper installation and insulation are key.


Conduction is the transmission of heat or cold through a material. In windows and patio doors, conduction occurs when there is a temperature difference on each side of the glass. In the summer, conduction occurs when warm air tries to get into the cool home. In the winter, conduction occurs when cold air leaks into the warm home. Multiple panes of glass and insulating gas, like argon, can help slow the effects of conduction.

Maximizing Energy Efficiency and Performance

Pella uses an infrared camera to visually show the efficiency of the glass in the window. We compare double-pane glass with no coatings or argon gas to double-pane glass with Low-E coating and argon gas. See what helps keep your home warmer in the winter and cooler in the summer.

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