Claims

REVIEW CLAIMS

More 5-Star Reviews than other leading full service window replacement companies
The Most 5-Star Reviews among leading full service window replacement companies

^{Review aggregator survey of 5-star reviews among leading national full-service window replacement companies. March 2026, Reputation.com.}

More than 1.5 million homeowners recommend Renewal by Andersen.

^{Based on Medallia homeowner satisfaction surveys of Renewal by Andersen customers January 2019-December 2025. Average scores between 9 and 10 using Net Promoter Score methodology on all survey questions after design consultation or installation project completed.}

Excellent Customer Service is the number one customer comment.

^{Based on Medallia homeowner satisfaction surveys of Renewal by Andersen customers 2015–June 2021. Average scores between 9 and 10 using Net Promoter Score methodology on all survey questions after installation project completed.}

BRAND CLAIMS

Nation's Best Window and Door Replacement Solution.
Renewal by Andersen is the nation’s best window and door replacement solution.

^{Review aggregator survey of the most 5 star reviews among leading national full service window and door replacement companies. March 2026, Reputation.com.}

Andersen is America’s most loved brand of windows and doors.
Andersen is the #1 premium window and door brand.
Andersen is the #1 recommended window and door brand.
Andersen is the #1 trusted window and door brand.

^{Renewal by Andersen is the full-service replacement division of Andersen.
2024 Andersen Brand Survey of U.S. Homeowner.}

WARRANTY CLAIMS

Renewal by Andersen has the nation’s best warranty coverage.

^{It is the only warranty among top selling window companies that meets all of the following requirements: easy to understand terms, unrestricted transferability, installation coverage, labor coverage, geographically unrestricted, coverage for exterior color, insect screens and hardware, and no maintenance requirement. Visit renewalbyandersen.com/nationsbest for details.}

Renewal by Andersen offers one of the strongest window and door replacement limited warranties you will ever find.
Fibrex^® material will not crack, pit, corrode, or rot.

^{See Renewal by Andersen® Products and Installation Transferable Limited Warranty for details.
Visit renewalbyandersen.com/warranty for details.}

DURABILITY AND PERFORMANCE CLAIMS

Scientifically proven to stand the test of time.
Twenty years after installation, test results show that our windows stand the test of time.
Our exclusive Fibrex^® material stays strong, even after 20 years of exposure to severe hot and cold temperatures.

^{Based on testing of 10 double-hung units 20 years after installation.}

Renewal by Andersen^® windows made with Fibrex® material: no cracking, peeling, or chipping – even after more than two decades of extreme weather.

^{Visit renewalbyandersen.com/warranty for details.}

Renewal by Andersen^® Acclaim™ replacement windows meet the strictest indoor emission standards in the U.S.

^{The products are Indoor Air Quality Gold certified by SCS global services, based on California Section 01350 Specification.}

Fibrex^® Material Finish Is 12 Times Thicker Than Painted Vinyl Finish

^{When Renewal by Andersen® products were tested against five leading competitors’ painted vinyl window products.}

ENERGY EFFICIENCY CLAIMS

High-Performance Low-E4^® glass is 47% more energy efficient in winter as compared to ordinary dual-pane glass.
High-Performance Low-E4^® glass is 56% more energy efficient in summer as compared to ordinary dual-pane glass.
High-Performance Low-E4^® SmartSun™ glass is 70% more energy efficient in summer as compared to ordinary dual-pane glass.
High-Performance Low-E4^® SmartSun™ glass is 49% more energy efficient in winter as compared to ordinary dual-pane glass.

^{Values are based on comparison of Renewal by Andersen® double-hung window U-factor to the U-factor for clear dual-pane glass non-metal frame default values from the 2006, 2009, 2012, 2015, and 2018 International Energy Conservation Code “Glazed Fenestration” Default Tables.}

Replacing old windows with ENERGY STAR certified windows lowers household energy bills by an average of up to 13 percent nationwide when replacing single-pane windows.

^{https://www.energystar.gov/products/res_windows_doors_skylights. Accessed July 2026. Savings may vary based on other home insulating attributes.}

OTHER

Custom Built in the USA

^{Using U.S. and imported parts}

30-year study: Durability Claims

Fibrex material continues to be 2x stronger than vinyl after 30 years in a home.
Fibrex material continues to withstand temperatures up to 150°F after 30 years in a home.
After 30 years in the field, Fibrex material was just as strong as Fibrex material made today.
After 30 years in a home, Fibrex material has not cracked, rotted, pitted, corroded, flaked, blistered or peeled. 
Our exclusive Fibrex material stays strong; even after 30 years of exposure to severe hot and cold temperatures.

^{Six window units were tested in a Minnesota home 30 years after installation. Visit renewalbyandersen.com for warranty information.}

Fibrex material stays strong, even after 30 years.
After 30 years, Fibrex material is still 2x stronger than vinyl. 

^{Ultimate Tensile Strength. Six window units were tested in a Minnesota home 30 years after installation. Visit renewalbyandersen.com for warranty information.} 

Fibrex material stands the test of time.

^{Visit renewalbyandersen.com/warranty for details.}