Attachments Energy Rating Council

Hunter Douglas Receives First-Ever Energy Performance Ratings For Interior Window Shades*

In 1985, Hunter Douglas pioneered the window fashions industry by inventing the first cellular honeycomb shades — one of the most energy-efficient window coverings on the market. Now, over 30 years later, Hunter Douglas has continued to pave the way as an industry leader by becoming the first manufacturer to earn a national energy performance rating and certification for interior window covering products through the Attachments Energy Rating Council (AERC).


By using the AERC energy ratings for an apples-to-apples comparison of window attachments, consumers can select just the right window treatments for their desired level of comfort and energy savings. Our energy-efficient window treatments (also referred to as window attachments) allow for temperature and light control as well as enhanced privacy, UV protection and glare reduction. All while saving energy.

About AERC

AERC is an independent, third-party verified, nonprofit organization partially funded and fully 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 for window attachments.


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. Using a sophisticated process of material testing and window modeling, AERC gauges the degree to which a window attachment will improve the performance of that window in reducing heating and cooling usage.

Which Hunter Douglas Products Are AERC Certified?

AERC certified products include Duette® (with the design inspired Alustra® Collection of Duette) and Applause® Honeycomb Shades in the Cellular Shade category, Sonnette® Cellular Roller Shades, select Designer Screen Shades and select Designer Roller Shades in the Roller Shade category and Vignette® Modern Roman Shades in the Roman Shade category.


NEW — AERC now has certification ratings for products paired with automation. The Warm and Cool Climate Ratings with Automation are now included for all AERC certified Hunter Douglas window treatments. These ratings measure the energy saving capabilities of the window attachment when it is used with an automated schedule.

AERC Energy Ratings Explained

It is important to know how window treatments play a crucial role in providing energy efficiency and comfort in a home. It is also necessary to look at all four ways AERC measures energy efficiency for our products — U-factor, Solar Heat Gain Coefficient (SHGC), Cool Climate rating and Warm Climate rating. U-factor and Solar Heat Gain Coefficient (SHGC) are based on the fabric and shade properties. Cool Climate rating and Warm Climate rating are based on a behavioral study of how homeowners, on average, open and close their shades.

  • U-factor
  • Measures the rate of heat transfer into or out of a home. 0.30 or lower is better.

  • SHGC
  • Measures how well a product blocks heat caused by sunlight. 0.30 or lower is better.

  • Cool Climate Rating
  • Rates how well the product performs in a cool climate based on how a homeowner on average moves their shades. A higher rating number is better.

  • Warm Climate Rating
  • Rates how well the product performs in a warm climate based on how a homeowner on average moves their shades. A higher rating number is better.

  • Automation Rating for Warm and Cool Climate
  • Rates how well the product can perform in each climate based on an optimized energy saving schedule where shades are automatically raised and lowered. A higher rating number is better.

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.

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):

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 Rebates 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

* Department of Energy, Office of Energy Efficiency and Renewable Energy article: