20 Best Window Companies in Riverside, IL (2023 Reviews)

Thinking about improving your property's insulation? The best window replacement companies can help.

We analyzed all the top-rated window companies in Riverside and selected the best 20 based on:

  • Customer reviews
  • Window installation expertise
  • Popularity with home-owners like you
EcoWatch Local Advisors

By EcoWatch Local Advisors

Updated September 15, 2023

Why you can trust EcoWatch

Our panel of energy experts work tirelessly to create unbiased reviews and informative content to help homeowners make educated decisions. No other windows site has covered energy efficiency and sustainability as long as EcoWatch, which means we're going to help you find windows replacements that will save on your energy bill and put more money back in your wallet.

Whether you're doing renovations or have damaged windows, windows play a vital role in conserving electricity in your home. If your house has outdated, drafty windows, your AC or heating system could be working extra hard to heat or cool your house. This means higher energy bills.

Fortunately, helping you save energy with upgraded windows also helps our goals of conserving energy and the resources it takes to make it.

Efficient windows are especially important in Riverside, where the temperature varies throughout the year. According to Energy Star, making the switch to energy-efficient windows can save the average homeowner up to $295 each year.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

Best Window Installation & Replacement Companies in Riverside

The EcoWatch team examined several installers in Riverside to find the top ones for our readers. The companies in this article passed our review standards for energy-efficient offerings as well as customer service, local expertise, price and beyond.

Window World logo
FAST QUOTE
as little as 30 seconds
Best Affordability

Window World

★★★★★
BBB Rating: A+
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Large serice area
  • Pros icon Low prices relative to competitors
  • Pros icon Great industry reputation
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Quality of service will depend on your area

Window World provides windows expertise in Riverside. It's the largest window replacement company in the country, known for its vinyl windows and affordability. This company has been in business since 1995 and currently serves 200 locations nationwide.

Window World may be the company for you if you want one that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital.

Energy Efficiency of Window World Windows

Window World is an Energy Star partner with a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so be sure to ask your Window World representative when inquiring about services.

How much does Window World cost in Riverside?

While pricing is not readily available on Window World’s website, it's known for offering some of the most affordable window installations around. For more detailed information on the cost, you can inquire about a quote from the company.

Renewal by Andersen logo
FAST QUOTE
as little as 30 seconds
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty
  • Pros icon More expensive than competition

Renewal by Andersen provides the best availability in Riverside. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. This company has 27 years of experience in the windows industry, and it has become one of the most respected companies in the business. Hundreds of positive reviews on customer review websites back the provider's reputation.

Andersen may be the company for you if you want one that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started.

Energy Efficiency of Renewal by Andersen Windows

Renewal by Andersen caters to eco-conscious consumers by providing energy-efficient window offerings. A handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019.

How much does Renewal by Andersen cost in Riverside?

Andersen does not detail prices on its website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. For more accurate information on the cost, you can ask for a quote from the company.

Universal Windows Direct logo
FAST QUOTE
as little as 30 seconds
Best Warranty

Universal Windows Direct

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 2002
Pros:
  • Pros icon Makes charitable contributions
  • Pros icon Manufactures products in-house
  • Pros icon Wide variety of products and services
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Limited service area
  • Pros icon Some installations carried out by third-party contractors
  • Pros icon Quality of service will depend on your area

Universal Windows Direct has the best warranty in Riverside. This window installation company has been in business since 2002 and currently provides services to 27 states nationwide. Its reputation is backed by a considerable amount of positive reviews from customers online.

If you’re looking for a company that has an industry-leading warranty covering products, parts and workmanship for life, Universal may be the right company for you.

Energy Efficiency of Universal Windows Direct Windows

The company offers energy-efficient UniShield brand windows. According to its website, UniShield window packages have higher gas fill rates and longer gas retention than most other brands on the market, and they are Energy Star products. Not all of Universal’s offerings are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.

How much does Universal Windows Direct cost in Riverside?

Prices aren’t displayed on Universal’s website, but installations typically range from $225 to $425 per window based on customer feedback. That makes Universal Windows Direct more of a budget-friendly option for window repair and replacements. Requesting a free quote on its website is the best way to know for sure.

Window Nation logo
FAST QUOTE
as little as 30 seconds
Best for Residential Windows

Window Nation

★★★★★
BBB Rating: A
Locations: Regional
Founded: 2006
Pros:
  • Pros icon Award-winning company
  • Pros icon Manufactures products in-house
  • Pros icon Custom designs
  • Pros icon Wide variety of products and services
Cons:
  • Pros icon Installation not covered by warranty
  • Pros icon Limited service area

Window Nation provides the best residential windows in Riverside. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. This company has 16 years of experience in the windows industry, and it has become one of the most respected companies in the business. Hundreds of positive reviews on customer review websites back the provider's reputation.

Window Nation may be the company for you if you want one that gives customers the opportunity to view products and to speak to a representative in person in its showrooms.

Energy Efficiency of Window Nation Windows

Window Nation caters to eco-conscious consumers by providing energy-efficient window offerings. Each product has windowpanes coated with a Low-E (low emissivity) glaze that prevents damaging UV rays from heating your home. Plus, the spaces between double- and triple-pane windows are filled with argon gas that’s been proven to improve home insulation.

How much does Window Nation cost in Riverside?

Window Nation does not detail prices on its website, but based on customer feedback, you can expect to pay between $300 and $525 per window installed, making it a more affordable option compared to competitors. For more accurate information on the cost, you can ask for a quote from the company.

We've recommended providers with good reputations, but note that some national companies have independently owned locations in Riverside, so your service may depend on your local crew. We have tried to be unbiased and transparent by listing pros and cons for each company reviewed.

More Window Companies in Riverside

Renewal by Andersen of Chicago

Lockport, IL
4.5
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Sliding Glass
  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Glass Showers
  • Service icon Stained Glass
  • Service icon Full-Service Installations

Website: https://www.renewalbyandersen.com/window-company/080-chicago-il/about-us
Address: 14503 S Gougar Rd #800, Lockport, IL 60491
Phone: (866) 836-2764

Window World Western Chicago

Lisle, IL
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Bay Windows
  • Service icon Sliding Glass
  • Service icon Fast Delivery

Website: https://www.windowworldwesternchicago.com/
Address: 4646 Western Ave, Lisle, IL 60532
Phone: (331) 903-6873

Window Nation

Romeoville, IL
4.2
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Double-Hung
  • Service icon Stained Glass
  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows
  • Service icon Bay Windows
  • Service icon Window Replacement

Website: https://www.windownation.com/chicago_showroom/
Address: 1263 Lakeview Dr, Romeoville, IL 60446
Phone: (815) 306-8024

Evergreen Door & Window

Evergreen Park, IL
4.4
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Sliding Glass
  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Fast Delivery
  • Service icon Aluminum Window Frames
  • Service icon Window Replacement
  • Service icon Double-Hung

Website: https://www.evergreenwindow.com/
Address: 3800 95th St, Evergreen Park, IL 60805
Phone: (708) 419-2116

Gilkey Window Company - Chicago Ridge

Chicago Ridge, IL
4.3
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Timely Service
  • Pros icon Educational Website

Services Offered

  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Window Replacement
  • Service icon Sliding Glass
  • Service icon Fast Delivery
  • Service icon Double-Hung
  • Service icon Commercial Windows

Website: https://www.gilkey.com/location/chicago-ridge-il/
Address: 10160 Virginia Ave, Chicago Ridge, IL 60415
Phone: (708) 229-2340

Pegasus windows Inc.

Westchester, IL
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Good Customer Service

Services Offered

  • Service icon Fast Delivery
  • Service icon Residential Windows
  • Service icon Window Replacement
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Custom Window Designs

Website: http://www.pegasusinchicago.com/
Address: 1359 Newcastle Ave, Westchester, IL 60154
Phone: (708) 639-5217

Real Exteriors

Schiller Park, IL
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Timely Service
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Window Replacement
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs
  • Service icon Double-Hung

Website: http://realexteriors.com/
Address: 3740 25th Ave, Schiller Park, IL 60176
Phone: (847) 305-3959

Best Windows Inc

La Grange Park, IL
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Good Customer Service

Services Offered

  • Service icon Bay Windows
  • Service icon Aluminum Window Frames
  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Commercial Windows
  • Service icon Residential Windows

Website: http://bestwindows.net/
Address: 1112 Cleveland Ave, La Grange Park, IL 60526
Phone: (708) 204-2446

Lang Exterior

Chicago, IL
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Sliding Glass
  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows
  • Service icon Window Repair
  • Service icon Commercial Windows

Website: http://langexterior.com/
Address: 2529 N Pulaski Rd, Chicago, IL 60639
Phone: (773) 772-6800

Commercial Windows & Glass Company

Chicago, IL
4.3
★★★★★
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Aluminum Window Frames
  • Service icon Sliding Glass
  • Service icon Tempered Glass
  • Service icon Window Repair
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Double-Hung
  • Service icon Commercial Windows
  • Service icon Glass Showers
  • Service icon Custom Window Designs

Website: https://commercialwindowsofchicago.com/
Address: 61255 W Henderson St, Chicago, IL 60634
Phone: (773) 945-5415

Next Door & Window

Burr Ridge, IL
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Stained Glass
  • Service icon Double-Hung
  • Service icon Window Replacement
  • Service icon Aluminum Window Frames
  • Service icon Custom Window Designs
  • Service icon Residential Windows

Website: https://www.nextdoorandwindow.com/
Address: 16W240 83rd St, Burr Ridge, IL 60527
Phone: (630) 323-6398

New Edge Window Replacement

Chicago, IL
4.2
★★★★★
  • Pros icon Timely Service
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Double-Hung
  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Window Repair
  • Service icon Residential Windows
  • Service icon Tempered Glass
  • Service icon Bay Windows
  • Service icon Energy-Efficient Options

Website: https://newedgewindowreplacement.com/
Address: 7155 W Belmont Ave, Chicago, IL 60634
Phone: (773) 243-4290

EDMAR Contractors Inc.

Chicago, IL
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Aluminum Window Frames
  • Service icon Residential Windows
  • Service icon Sliding Glass
  • Service icon Fast Delivery
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Stained Glass
  • Service icon Window Replacement

Website: http://www.illinoissidinginstaller.com/
Address: 4413 W Montrose Ave #1, Chicago, IL 60641
Phone: (312) 222-0200

SmardBuild Construction

Addison, IL
4.4
★★★★★
  • Pros icon Timely Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Good Customer Service

Services Offered

  • Service icon Sliding Glass
  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Aluminum Window Frames
  • Service icon Commercial Windows
  • Service icon Window Replacement
  • Service icon Fast Delivery
  • Service icon Custom Window Designs

Website: https://www.smardbuild.com/
Address: 924 S Westwood Ave, Addison, IL 60101
Phone: (630) 237-4205

Durabuilt Home Improvements, Inc.

Elmhurst, IL
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Window Replacement
  • Service icon Glass Showers
  • Service icon Double-Hung
  • Service icon Custom Window Designs

Website: https://www.durabuilthi.com/
Address: 747 Church Rd Suite C2, Elmhurst, IL 60126
Phone: (630) 941-1800

Valdicass Inc.

Brookfield, IL
4.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows

Website: https://www.valdicass.com/
Address: 8920 47th St, Brookfield, IL 60513
Phone: (708) 255-5231

Horizon Restoration

Chicago, IL
4.3
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Timely Service

Services Offered

  • Service icon Full-Service Installations
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Commercial Windows

Website: http://www.horizonrestoration.com/
Address: 7122 W Higgins Ave, Chicago, IL 60656
Phone: (773) 219-1688

Dilworth Windows & Doors Inc.

Westmont, IL
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Energy-Efficient Options

Website: https://www.dilworthwindows.com/
Address: 223 N Cass Ave, Westmont, IL 60559
Phone: (630) 960-4300

Transparent Window & Glass Company

Oak Park, IL
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement
  • Service icon Commercial Windows
  • Service icon Custom Window Designs
  • Service icon Fast Delivery
  • Service icon Window Repair
  • Service icon Residential Windows

Website: http://transparentoakpark.com/
Address: 815 Lake St #2n, Oak Park, IL 60301
Phone: (708) 634-8211

Midwest Windows Direct

Chicago, IL
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Energy-Efficient Options
  • Service icon Residential Windows

Website: https://mymidwestwindows.com/
Address: 3256 W Ogden Ave, Chicago, IL 60623
Phone: (773) 786-9401
Riverside Window Cost Calculator

Calculate how much you can expect to pay for window installation and replacement in Riverside, IL using our customized window cost calculator.

Estimated Window Cost:
161 homeowners have requested a free estimate in the last 3 days.

Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.

How Installing Energy-Efficient Windows in Riverside Saves You Money

Energy-efficient windows can provide benefits in more than one way. Here are a few reasons you may want to take the plunge and make the switch:

  • Protect your investment: If you have an older home, your windows are most likely outdated. Updating your windows can make your home more comfortable and also help raise the value of your house if you decide to sell.
  • Save on electricity bills: After you switch to energy-efficient windows, you can see a reduction in your bills by about 12% because you'll use less energy to heat or cool your home.
  • Better temperature control in your home: When you reside in a place like Riverside where the winters can get very cold, you usually need to depend on your heater to keep your house warm. Energy-efficient windows can lower how much heat is lost through your windows when heating your home.
  • Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only insulate your home better, but also filter out harmful UV rays, preventing fading of your furniture, carpet and other valuables.

Estimated Cost of Window Replacement in Riverside

Windows come in all shapes and sizes, so costs and services will vary tremendously. Here are the typical costs and services that you can find from window installation companies.

How Much Do New Windows Cost?

On average, Riverside homeowners can anticipate their window replacements to range from $250 to $1,200. The average cost sits at approximately $600. This is due to the fact that window installations depend on several factors specific to your home, such as the size, material and number of windows you need to install, as well as the location of your property.

Whether or not you choose energy-efficient windows is another factor that will influence the cost. These will usually cost more than other windows, but on the other hand, you can save about $295 a year on your energy bills in Riverside.

We recommend requesting free quotes from multiple window installers to find the right windows and the company that works best for you.

What Services do Window Installers Offer?

In regard to window installations, in general there are two kinds that your installer will offer: full-frame and pocket installations.

Full-frame installations are usually recommended when you want to change the style of your windows or your window has a lot of rot. With this service, your installers will replace the full window, including the frame, sill and trim. Pocket installations (also known as retrofits) are when you replace a window within its existing frame. Pocket installations are on the simpler end and won't cost as much, but you can't do this type of installment if you have any pre-existing rot or water damage.

Your window replacement company will be able to help you figure out what's best for your needs. In Riverside, the decision will mostly depend on the age of your home and if there's any damage. Wood can decay if not maintained properly over the years, so it's good to have a professional check your frames and window sills.

Best Availability

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house

Best Energy-Efficient Features

Champion

★★★★★
4.5

  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty

Window Veteran

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Wide variety of products and services
  • Lifetime Warranty

How We Choose the Best Window Installers in Riverside

In our hunt to make your home improvements easier and more eco-friendly in Riverside, the EcoWatch team landed on the above companies as the top window installation companies in the city. We've evaluated the best window replacement companies in Riverside mostly based on their energy efficient offerings, as the most sustainable option also benefits homeowners in many ways. Energy Star certified windows can cut your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:

Service Area

Since this is a guide for Riverside, we paid more attention to companies that provide services to the city. There are certainly other reputable providers that didn't make the cut because they wouldn't be able to serve homeowners in Riverside.

Work Quality

When it comes to new windows, the quality and breadth of services can often play just as important of a role in insulation and performance as the brand you choose. We do give window installers more points if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.

Customer Reviews

We analyzed patterns in recent customer feedback to determine the companies with the most customer satisfaction. Customer satisfaction may be the most important factor, as it indicates the quality of services across nearly every category, including warranty, cost, quality of parts, quality of installation, professionalism and more.

Cost

Cheaper windows don't necessarily mean better windows, but we know many of our readers want to keep costs low when possible. When analyzing the prices of providers, we gave higher scores to companies with reasonable prices and accessible financing rather than "cheaper" services.

Warranty

As discussed previously, windows are a hefty investment, so you'll want to make sure that investment is well protected. Window installation companies that have lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

Years of Experience

Last but not least, we like to see companies that have been in the industry for quite some time. Window installation companies that have more experience will earn higher rankings by our standards. We like to see at least ten years of experience.

Riverside, IL Window Replacement FAQs

How much should a window install cost?

The national average cost to install a window is about $600 but can range between $200 and $1,200, based on several factors. The price is generally dependent on the location of your property, the size of the window and the type and material of the window. Also, keep in mind that energy-efficient windows may cost more initially but can save you hundreds of dollars a year in energy bills.

What are the most common types of replacement windows?

The most common types of windows for homes are double-hung and single-hung windows, bay windows, picture windows, transom windows, awning windows, casement windows and slider windows.

When should I use a window installation company?

You should hire a window installation company whenever you want to replace your windows. Installing windows is a complicated process that can be difficult to do on your own, so it's best handled by the professionals.

How do you know it's time to replace your windows?

Windows have a typical lifespan of about 20 to 30 years. If your windows are older than that, then they should probably be replaced. Apart from that, if your windows have damage anywhere on them, or they have become difficult to operate, they may need to be replaced.

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