Most people can enjoy optimal energy performance and comfort with Low-E/Low-E4® glass. Low-E glass reflects heat in the summer and helps keep heat inside in the winter, making this a good choice in climates where both heating and cooling costs are a concern.

Ideal for: All Climates

Available on: Low-E glass is available on all Andersen products.

SmartSun™ glass gives you the benefits of Low-E glass, plus it helps shield your home from the sun’s heat and filters out 95% of harmful UV rays while letting sunlight shine through.

Ideal for: All Climates

Available on: SmartSun™ glass is available on all Andersen® products.

Sun glass offers outstanding thermal performance with a subtle tint that blocks out even more heat from the sun.  

Ideal for: Southern Climates

Available on: E-Series, A-Series, 400 Series, 200 Series and 100 Series products.

If you live in a cold climate, PassiveSun® glass allows the sun to heat your home.

Ideal for: Northern Climates

An extra pane of glass helps keep more heat in and cold air out, making this our most energy-efficient glass option. Perfect for colder climates where more months of the year are spent heating the home.

Ideal for: Northern Climates

Available on: A-Series Windows and Patio Doors, E-Series Windows and Patio Doors, 400 Series Patio Doors, select 200 Series Patio Doors, and now select 100 Series windows.

_{Select Andersen® A-Series windows are recognized as Most Efficient of ENERGY STAR® in 2025. Specific glass options apply.}

Clear dual-pane glass offers basic thermal performance. It's available on select Andersen products in situations where codes allow its use. See your local code official for requirements in your area.

HeatLock® coating can be added to most of our glass options and reflects heat that likes to escape your home.

Ideal for: Northern Climates

Available on: HeatLock Technology is available with most of our products.