AERC + Hunter Douglas



Since 1985, Hunter Douglas has been pioneering the window fashions industry with superior energy-efficient shades — enabling homeowners to be as fashionable as they are comfortable. That’s because our energy-efficient window treatments (also referred to as window attachments) allow for temperature and light control as well as enhanced privacy and glare reduction. All while saving energy.

Paving the way as an industry leader, Hunter Douglas has become the first manufacturer to earn a national energy performance rating and certification for interior window covering products through the Attachments Energy Rating Council (AERC).

Now, consumers can select just the right window treatments for their desired level of comfort by using the AERC ratings as an apples-to-apples comparison of window attachments.


About AERC

AERC is an independent, public interest, nonprofit organization partially funded and supported by the U.S. Department of Energy with additional support from the Window Covering Manufacturers Association (WCMA). Made up of a diverse set of stakeholders, including manufacturers, government bodies, testing labs and utilities, the AERC team works together to deliver a successful national energy performance rating program.


The Importance of AERC Ratings

AERC’s mission is to rate, label and certify window attachments in order to help homeowners, architects and builders make informed decisions when it comes to buying energy-efficient products. Never before has there been access to such a highly accurate, apples-to-apples comparison of window attachments. Using a sophisticated process of material testing and window modeling, AERC gauges the degree to which a window attachment — such as a shade, blind or shutter — will improve the performance of that window in reducing heating and cooling usage.


The Benefits of AERC Rated and Certified Products

In a cool climate (or winter), AERC rated and certified window treatments can:
• Help keep interiors warmer
• Reduce heat from escaping
• Use free sunlight to warm spaces
• Eliminate chilly drafts
• Lower heating energy costs

In a warm climate (or summer), AERC rated and certified window treatments can:
• Help keep interiors cooler
• Block solar heat gain
• Minimize harsh sunlight and glare
• Reduce hot outside air from entering
• Lower cooling energy costs

In a mixed climate, AERC rated and certified window treatments can provide the benefits of both cool and warm climates.


Which Hunter Douglas Products Are AERC Certified?

89% of Americans say it’s important for their home to be energy efficient. Now, they can look for window attachments bearing the AERC Energy Improvement label that have been certified for energy efficiency.

Currently, select Duette® and Applause® Honeycomb Shades are certified in the AERC cellular shade category, and Sonnette™ Cellular Roller Shades are certified in the roller shade category. Other product lines are being considered for certification. Additionally, AERC is working on an Automation rating based on an optimal schedule to open and close shades for greater energy savings.

Click here to find a list of Hunter Douglas AERC certified products.


What Do the AERC Ratings Mean?

AERC ratings represent the amount of energy saved that would otherwise be lost through a window without the use of a window attachment. These ratings are based on several factors: U-factor, Solar Heat Gain Coefficient (SHGC), how often the shades on average are manually opened and closed on a daily basis, the baseline window, orientation, season and climate. This information is then factored into simulations using software developed by the Lawrence Berkeley National Lab.


Cool Climate and Warm Climate Ratings

There are two types of AERC ratings — a Cool Climate rating and a Warm Climate rating. Both Cool and Warm Climate ratings are on a scale from 0 to a Max Improvement rating. Each product category has its own particular Cool Climate and Warm Climate Max Improvement ratings.

AERC Cool and Warm AERC Cool and Warm


The most important thing to remember is that the closer the rating (listed on the left) is to the Max number (listed on the right), the better the rating. And overall, the higher the rating, the greater the potential for energy savings.

To learn more, including detailed information about the U-factor and SHGC, visit the AERC website.

AERC map AERC map


National Lab Reports

To learn more about the energy efficiency of Hunter Douglas Duette® Architella® Honeycomb Shades, read these reports from the Pacific Northwest National Lab (PNNL):

Testing the Performance and Dynamic Control of Energy Efficient Cellular Shades in the PNNL Lab Homes

PNNL Cellular Shade Modeling EnergyPlus


Utility Rebates

Now, with AERC’s first-ever third-party verified national standard program for the energy performance of window attachments, it’s easier for utility companies to rebate window treatments. Want to know if your local utility company offers a rebate on energy efficient window coverings? Visit our Utility Rebate page for a list. Check back regularly as more utilities add window treatments to their rebate programs.


For more information about AERC, visit the AERC website at