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

Thinking of improving your property's value? The best window replacement companies can help.

We analyzed all the top-rated window companies in Proviso 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 key role in conserving energy in your home. Damaged or outdated windows can cost you in electricity bills. As a matter of fact, the Department of Energy estimates that 25-30% of your house's heat or cool air could be lost through your windows.

Replacement windows improve your home's insulation, not only making you and your family more comfortable during extreme temperatures, but also saving you some money and helping the environment.

So if you're constructing a new home, renovating or replacing your windows in Proviso, this guide is the best place to get started.

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 Proviso

The EcoWatch Reviews team researched dozens of companies that service the Proviso area to find the top window installation companies that fit our standards. The providers mentioned in this article scored the best in our review categories, which include energy-efficient offerings, local expertise, price, customer service, availability and more.

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 is the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has over 27 years of experience in the windows industry, and it currently provides services to 200 locations nationwide.

You may want to consider picking Window World if you're looking for a installer 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 carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality Energy Star windows when inquiring. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.

How much does Window World cost in Proviso?

Window World does not list prices on its website, but it's known for offering some of the most affordable window installations around. Getting a free quote on its website is the best way to get more accurate pricing information.

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 has the best availability in Proviso. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has about 27 years of experience in the industry, and it currently provides services to nearly every state except Mississippi and West Virginia. Many positive reviews on customer review websites back the company's reputation.

You may want to consider opting for Andersen if you're looking for a company 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

There are a wide variety of window types that Renewal by Andersen offers, some of which are Energy Star products. 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 Proviso?

Andersen doesn’t have any pricing information displayed 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. If you’d like more accurate pricing information, you can receive a quote on the company’s website.

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 is a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. Universal has around 20 years of experience in the industry, and it currently serves 27 states nationwide. The provider has plenty of positive reviews from customers on online review websites.

You may want to consider opting for Universal if you're looking for a installer that has an industry-leading warranty covering products, parts and workmanship for life.

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 want Energy Star windows when inquiring.

How much does Universal Windows Direct cost in Proviso?

Universal doesn’t have any prices listed on its 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. For more accurate information on the cost, you can get a quote from the company.

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 has the best residential windows in Proviso. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has about 16 years of experience in the industry, and it currently provides services to residents within 75 miles of its showrooms, which are in 13 states. Many positive reviews on customer review websites back the company's reputation.

You may want to consider opting for Window Nation if you're looking for a company 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

There are a wide variety of window types that Window Nation offers, some of which are Energy Star products. 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 Proviso?

Window Nation doesn’t have any pricing information displayed 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. If you’d like more accurate pricing information, you can receive a quote on the company’s website.

We strive to remain unbiased and transparent by mentioning pros and cons for each installer. Additionally, any partnerships do not influence our reviews.

More Window Companies in Proviso

Renewal by Andersen of Chicago

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

Services Offered

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

Website: https://www.renewalbyandersen.com/window-company/080-chicago-il/about-us
Address: 2300 Ridge Dr, Glenview, IL 60025
Phone: (847) 486-5680

Window World Western Chicago

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

Services Offered

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

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

Window Nation

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

Services Offered

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

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

SmardBuild Construction

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

Services Offered

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

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

123 Exteriors Downer's Grove

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

Services Offered

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

Website: https://www.123exteriors.com/roofing-siding-contractor-downersgrove
Address: 2777 Finley Rd #17, Downers Grove, IL 60515
Phone: (630) 517-4771

Pegasus windows Inc.

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

Services Offered

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

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 Price Transparency
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

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

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 Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Aluminum Window Frames
  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • Service icon Residential Windows
  • Service icon Commercial Windows
  • Service icon Bay 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 Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Sliding Glass
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung
  • Service icon Window Replacement
  • Service icon Custom Window Designs
  • Service icon Commercial Windows
  • Service icon Window Repair
  • Service icon Residential 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 Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Educational Website

Services Offered

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

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

Horizon Restoration

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

Services Offered

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

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

Next Door & Window

Burr Ridge, 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 Double-Hung
  • Service icon Stained Glass
  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Window Replacement

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 Free assessment
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

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

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 Good Customer Service
  • Pros icon Price Transparency

Services Offered

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

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

Erie Home

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

Services Offered

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

Website: https://www.eriehome.com/location/chicago/
Address: 414 Eisenhower Ln N North, Lombard, IL 60148
Phone: (630) 228-9210

Ultimate Home Solutions

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

Services Offered

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

Website: https://www.ultimatehomesolutions.net/
Address: 466 Roosevelt Rd, Glen Ellyn, IL 60137
Phone: (630) 757-8694

Durabuilt Home Improvements, Inc.

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

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Double-Hung
  • Service icon Window Replacement
  • 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 Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Custom Window Designs
  • Service icon Window Replacement
  • 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

Royal Craft Home Remodelers Inc.

Downers Grove, IL
4.2
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

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

Website: https://royalcraftremodelers.com/
Address: 1525 Ogden Ave, Downers Grove, IL 60515
Phone: (630) 725-1000

Dilworth Windows & Doors Inc.

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

Services Offered

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

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

Calculate how much you can expect to pay for window installation and replacement in Proviso, 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 Proviso Saves You Money

By switching to energy-efficient windows, you and your family can take advantage of several benefits, such as:

  • Protect your investment: The older your home is, the more likely you are to benefit from switching to energy-efficient windows. Older homes usually have windows that are outdated, leaky or potentially even damaged in some way. Updating your windows could help increase the value of your home if you decide to sell.
  • Better temperature control in your home: When you live in a city like Proviso where the winters can get very cold, you usually need to rely on your heater to keep your house warm. Energy-efficient windows can decrease how hard your heater needs to work to heat your home.
  • Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent the fading of your floors, carpets and furniture by filtering out UV rays.
  • Save money on electricity bills: Since energy-efficient windows decrease the amount of energy needed to heat or cool your home, they can help you save about $295 annually on your energy bills in Proviso.

Estimated Cost of Window Replacement in Proviso

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

How Much Do New Windows Cost?

The typical cost to replace a single window is about $600 but can range from $200 to $1,200. How much it will cost is based on several factors, such as number of windows, type, material, size, the location of your home and more.

It's important to bear in mind that windows with higher efficiency may cost more upfront but can save you hundreds of dollars by lowering your energy bills. Investing in Energy Star certified windows can save Proviso homeowners $295+ a year when replacing single-pane windows.

Requesting free quotes from multiple companies is the best way to find out which one is right for you.

What Services do Window Installers Offer?

The first step when planning a window installation is to think about whether you want a full-frame or pocket installation.

Full-frame installations entail replacing the total window, including the sill, trim and frame. You most likely need a full-frame installation when you want to change the style of your windows or your window has noticeable deterioration. Because full-frame installations are more involved, they will raise the total cost. Pocket installations (or retrofits) entail installing a new window within its existing frame, which makes pocket installations less labor-intensive and costly. However, if the frame has any damage or rot, you should opt for a full-frame installation instead.

Your window installation company should be able to help you figure out which type of installation you need.

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 Proviso

In our hunt to make your home improvements easier and more eco-friendly in Proviso, the EcoWatch team examined many companies before deciding on these. We've evaluated the top window installers in Proviso mostly based on energy efficiency, as the most sustainable option also benefits homeowners in many ways. Energy Star certified windows can reduce your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology is based on the following factors:

Service Area

This one is pretty self-explanatory, but we've chosen to highlight window installers that serve a wide variety of states and cities so you can find the best window installation company near you.

Work Quality

When selecting new windows, the quality and range of services often plays just as important of a role in overall efficiency and performance as the brand of window you get. We do rate window installers higher if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.

Customer Reviews

Another self-explanatory yet very important review factor is customer feedback. If most customers don't have positive feedback about their service from a certain installer, it won't be featured on EcoWatch.

Cost

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

Warranty

Protecting your investment in new windows is important to many homeowners. For that reason, window installation companies that provide lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

Because of Proviso's climate, homeowners need to be wary of rot, low efficiency and water damage. We factored in local experience to reflect the ability of Proviso window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.

Proviso, IL Window Replacement FAQs

What is the typical cost to install new windows?

The average cost to install one window ranges between $450 and $650. There are many factors that affect how much it costs, such as local labor costs, your property's location, styles and sizes of windows, how energy-efficient the windows are, the number of windows and the materials used in designing the windows.

Which kind of window should I get?

Generally, double-pane windows are more efficient than single-pane windows and windows that don't open are more efficient than windows that do. To be sure you're getting the most energy-efficient windows, look for models that have the blue Energy Star certification attached to them — this means they're certified energy-efficient by the U.S. Department of Energy.

What services do window replacement companies do?

Window installers cover the entire process — from replacing old windows with new ones to cleaning up afterward. Additionally, many companies offer window manufacturing, customization and repairs.

How often do you need to replace 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 be in need of replacement.

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