23 Best Window Replacement Companies in Candia, NH (Jan 2023)
Window Companies Near Me

Thinking of improving your property's look? The top window replacement companies can help.

We analyzed all the top window installers in Candia and selected the top 23 based on:

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

By EcoWatch Local Advisors

Updated January 12, 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.

A review of the best window replacement companies in Candia may not seem like the most interesting article on the EcoWatch site, but trust us, windows have more of an impact on your life than you might realize. When it's the middle of winter, your outdated and drafty windows could be making your home harder to heat and costing you more in power bills.

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

As windows have such a considerable impact on your home, selecting the right company for you is a big choice to make. That's why the EcoWatch team has curated this list of the best window installation companies, so you can more easily make an informed decision.

Best Affordability

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Lifetime warranty
  • Low prices relative to competitors
  • Quality of service will depend on your area

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Award-winning company
  • Manufactures products in-house
  • More expensive than competition

Best for Businesses

Aeroseal Windows

★★★★★
4

  • Manufactures products in-house
  • Many years of experience
  • Great industry reputation
  • Not ideal for residential installations

Best Window Replacement Companies in Candia

The EcoWatch Reviews team researched many window installation companies in Candia to find the top ones for our readers. We assessed the providers on energy-efficient offerings, local experience, coverage area, customer service, price 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 Lifetime warranty
  • Pros icon Low prices relative to competitors
Cons:
  • Pros icon Quality of service will depend on your area

Window World has windows expertise in Candia. Window World has over 27 years of industry experience, and it currently provides services to 200 locations nationwide. Hundreds of positive reviews on customer review websites back the company's reputation.

Window World may be the company for you if you're interested in 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 and has a variety of energy-efficient windows. Note that not all of the company's windows are Energy Star certified, so be sure to mention that you want energy-efficient windows to your Window World representative when inquiring about services.

How much does Window World cost in Candia?

Prices are not available on Window World's website, as the cost of window installment depends on how many and what type(s) of windows you need. However, it's known for offering some of the most affordable window installations around. If you'd like more accurate pricing information, you can request a quote on the company's website.

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 Manufactures products in-house
Cons:
  • Pros icon More expensive than competition

Renewal by Andersen is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window installation business for about 27 years. Its reputation is backed by hundreds of positive reviews on customer review websites.

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, Andersen may be the right company for you.

Energy Efficiency of Renewal by Andersen Windows

Renewal by Andersen 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 Andersen representative when inquiring about services.

How much does Renewal by Andersen cost in Candia?

Andersen doesn't have any cost 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. For more accurate information on pricing, you can ask for a quote from the company.

Aeroseal Windows logo
FAST QUOTE
as little as 30 seconds
Best for Businesses

Aeroseal Windows

★★★★★
BBB Rating: A+
Locations: Regional
Founded: 1999
Pros:
  • Pros icon Manufactures products in-house
  • Pros icon Many years of experience
  • Pros icon Great industry reputation
Cons:
  • Pros icon Not ideal for residential installations

Aeroseal Windows is an installer that mainly serves commercial and multifamily properties, and also specializes in railings. If you’re looking for residential window installations, you should probably refer to one of the other companies on this list. Aeroseal has about 23 years of experience in the windows industry, and it currently serves 13 states and Washington D.C.

If you're looking for a company that installs windows and doors at businesses across the Eastern U.S, Aeroseal may be the right provider for you.

Energy Efficiency of Aeroseal Windows Windows

Aeroseal Windows has some Energy Star windows, but note that not all its windows are energy-efficient, so make sure you ask for Energy Star windows when inquiring. The company claims it helps businesses save on energy expenses and reduce their carbon footprints with energy-efficient windows, as well as practices like Low-E glass coating, weatherstripping and more.

How much does Aeroseal Windows cost in Candia?

Aeroseal does not detail prices on its website, but it provides high-quality windows at a competitive price point. You can request a free quote on its website for more information about the cost.

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 provides the best warranty in Candia. It's a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. Universal has about 20 years of experience in the window installation business. Many positive reviews on customer review websites back the company's reputation.

It 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 make sure you mention that you're interested in Energy Star windows when inquiring.

How much does Universal Windows Direct cost in Candia?

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. You can ask for a free quote on its website for more information about pricing.

Please note that the following companies are national, which means the quality of customer service may vary depending on your local team. We have tried to remain unbiased and transparent by listing pros and cons for each company.

More Window Replacement Companies in Candia

Merrimack Valley Glass & Mirror

Newburyport, MA
4.3
★★★★★
  • Pros icon Timely Service
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Double-Hung
  • Service icon Full-Service Installations
  • Service icon Custom Windows
  • Service icon Stained Glass
  • Service icon Residential Windows
  • Service icon Business Windows
  • Service icon Sliding Glass
  • Service icon Aluminum Window Frames
  • Service icon Glass Showers

Website: https://www.merrimackvalleyglass.com/
Address: 5 Perry Way #7, Newburyport, MA 01950
Phone: (978) 463-9990

Nashua Glass

Nashua, NH
4.1
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Award-Winning
  • Pros icon No-Hassle Pricing
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Tempered Glass
  • Service icon Doors
  • Service icon Custom Window Designs
  • Service icon Commercial Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://www.nashuaglass.com/
Address: 110 Chestnut St, Nashua, NH 03060
Phone: (603) 882-0648

The Window Source NH

Seabrook, NH
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Helps Educate Customers
  • Pros icon No-fee Quotes
  • Pros icon Award-Winning

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://www.windowsourcenh.com/
Address: 779 Lafayette Rd Suite 1, Seabrook, NH 03874
Phone: (888) 282-2912

Timberlane Glass and Mirror

Plaistow, NH
3.7
★★★★★
  • Pros icon Reliable Service
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency

Services Offered

  • Service icon Full-Service Installations
  • Service icon Custom Windows
  • Service icon Residential Windows
  • Service icon Sliding Glass
  • Service icon Commercial Windows

Website: http://www.timberlaneglass.com/
Address: 108 Main St, Plaistow, NH 03865
Phone: (603) 382-6969

Southers Construction

Dover, NH
3.7
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Appointment Windows
  • Pros icon Award-Winning

Services Offered

  • Service icon Double-Hung
  • Service icon Full-Service Installations
  • Service icon Custom Window Designs

Website: http://southersconstruction.com/
Address: 12 Crosby Rd, Dover, NH 03820
Phone: (603) 605-8037

Pro Entry Installs LLC

Salem, NH
3.6
★★★★★
  • Pros icon Arrives on Time
  • Pros icon Reliable Service
  • Pros icon No-Hassle Pricing
  • Pros icon Educational Website

Services Offered

  • Service icon Custom Windows
  • Service icon Residential Windows
  • Service icon Double-Hung
  • Service icon Bay & Bow Windows

Website: https://proentry.com/
Address: 7 Cassidy Ave #2863, Salem, NH 03079
Phone: (603) 765-1312

Window World of New Hampshire

Manchester, NH
3.6
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Free Quotes
  • Pros icon Dependable Service
  • Pros icon Helps Educate Customers

Services Offered

  • Service icon Custom Windows
  • Service icon Architectural Glass
  • Service icon Sliding Glass
  • Service icon Double-Hung

Website: https://www.windowworldnewhampshire.com/
Address: 735 E Industrial Park Dr Unit A, Manchester, NH 03109
Phone: (603) 935-9878

Guaranteed Aluminum & Vinyl Inc

Lowell, MA
3.3
★★★★★
  • Pros icon Dependable Service
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing
  • Pros icon Free Quotes

Services Offered

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

Website: https://lowell-window-replacement-glass-repair.com/
Address: 349 Bridge St, Lowell, MA 01850
Phone: (978) 452-2392

Demers Plate Glass Co

Haverhill, MA
3.3
★★★★★
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing
  • Pros icon Helps Educate Customers
  • Pros icon Free Quotes

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Doors
  • Service icon Custom Windows
  • Service icon Aluminum Window Frames
  • Service icon Business Windows

Website: https://www.demersplateglass.com/
Address: 373 River St, Haverhill, MA 01832
Phone: (978) 374-6387

Clear Choice Home Improvements

Manchester, NH
3.3
★★★★★
  • Pros icon Locally Recognized for Quality
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency
  • Pros icon Consistent Workmanship

Services Offered

  • Service icon Custom Windows
  • Service icon Sliding Glass
  • Service icon Double-Hung

Website: http://www.clearchoicehomeimprovement.com/
Address: 8025 S Willow St #107, Manchester, NH 03103
Phone: (603) 232-0237

Milford Windows & Siding

Milford, NH
3.3
★★★★★
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency
  • Pros icon Consistent Workmanship

Services Offered

  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Commercial Windows

Website: https://123siding.com/
Address: 69 Woodhawk Dr, Milford, NH 03055
Phone: (603) 213-1157

Queen City Glass & Mirror

Manchester, NH
3.2
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Dependable Service
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Full-Service Installations
  • Service icon Business Windows
  • Service icon Sliding Glass

Website: http://qcglass.com/
Address: 295 Elm St, Manchester, NH 03101
Phone: (603) 666-0302

Pane Free Glass

Manchester, NH
3.2
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Free Quotes
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Custom Window Designs
  • Service icon Full-Service Installations
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://panefreeglass.com/
Address: 270 Amory St #17, Manchester, NH 03102
Phone: (603) 497-1830

Blind Gallery New England

Stratham, NH
3.2
★★★★★
  • Pros icon Educational Website
  • Pros icon Free Quotes
  • Pros icon Excellent Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Custom Windows
  • Service icon Aluminum Window Frames
  • Service icon Energy-Efficient Options
  • Service icon Sliding Glass

Website: http://www.blindgallerynewengland.com/
Address: 72 Portsmouth Ave, Stratham, NH 03885
Phone: (978) 857-1617

Alton Bay Blinds of New England

Hampton, NH
3.2
★★★★★
  • Pros icon Free Quotes
  • Pros icon Helps Educate Customers
  • Pros icon Excellent Customer Service
  • Pros icon Locally Recognized for Quality

Services Offered

  • Service icon Custom Window Designs
  • Service icon Sliding Glass
  • Service icon Business Windows
  • Service icon Double-Hung

Website: https://www.abblinds.com/
Address: 387 Lafayette Rd, Hampton, NH 03842
Phone: (603) 965-2114

Atlantic Window Warehouse

Newburyport, MA
3.2
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Educational Website
  • Pros icon Reliable Appointment Windows
  • Pros icon Free Quotes

Services Offered

  • Service icon Custom Windows
  • Service icon Residential Windows
  • Service icon Sliding Glass
  • Service icon Double-Hung

Website: https://www.atlwindow.com/
Address: 155 State St, Newburyport, MA 01950
Phone: (978) 465-9696

City Mirror & Glass Co

Lowell, MA
3.1
★★★★★
  • Pros icon Free Quotes
  • Pros icon Helps Educate Customers
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Custom Windows
  • Service icon Commercial Windows
  • Service icon Sliding Glass

Website: http://www.citymirror.net/
Address: 90 Lincoln St, Lowell, MA 01851
Phone: (978) 452-5976

Methuen Glass 2

Methuen, MA
3.1
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon No-fee Quotes
  • Pros icon Good Customer Service

Services Offered

  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Business Windows
  • Service icon Sliding Glass

Website: http://www.methuenglass.com/
Address: 468 Merrimack St, Methuen, MA 01844
Phone: (978) 682-8233

Pella Windows & Doors of Bedford

Bedford, NH
3.1
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Helps Educate Customers
  • Pros icon No-fee Quotes
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Architectural Glass
  • Service icon Custom Windows
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.pellabranch.com/new-england/showrooms/bedford/
Address: 384 State Rte 101 Unit #2, Bedford, NH 03110
Phone: (603) 725-4670

Newell and Crathern

Loudon, NH
3.1
★★★★★
  • Pros icon Price Transparency
  • Pros icon Helps Educate Customers
  • Pros icon No-fee Quotes
  • Pros icon Excellent Customer Service

Services Offered

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

Website: http://www.newellandcrathern.com/
Address: Loudon, NH
Phone: (603) 228-2102

Glass Routes Co

Madbury, NH
3.1
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Educational Website
  • Pros icon Excellent Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Business Windows
  • Service icon Sliding Glass

Website: http://www.glassroutes.net/
Address: 181 Littleworth Rd, Madbury, NH 03823
Phone: (603) 742-2600

Pella Windows & Doors of Newington

Newington, NH
3.1
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon No-Hassle Pricing
  • Pros icon No-fee Quotes
  • Pros icon Excellent Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Custom Windows
  • Service icon Commercial Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.pellabranch.com/new-england/showrooms/newington/
Address: 25 Fox Run Rd Suite 2, Newington, NH 03801
Phone: (603) 725-4690

Port City Glass

Salisbury, MA
3.1
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Custom Window Designs
  • Service icon Business Windows
  • Service icon Sliding Glass

Website: http://www.portcity-glass.com/
Address: 141 Bridge Rd, Salisbury, MA 01952
Phone: (978) 255-2803

How Installing Energy-Efficient Windows in Candia Saves You Money

Upgrading to energy-efficient windows can improve the comfort of your home and help you save on energy bills. Here are more ways upgrading your windows could help you:

  • Reduce your carbon footprint: Because energy-efficient windows improve the insulation in your house, you can reduce your carbon footprint by about 12%, according to Energy Star.
  • Protect your investment: Upgrading your windows is an important part of maintaining your property and its value, particularly if your home is on the older side.
  • Save on power bills: Once you switch to energy-efficient windows, you can see a reduction in your bills by about 12% since you'll require less energy to heat or cool your home.
  • Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.

Estimated Cost of Window Replacement in Candia

Each window installer offers various services and has varying costs based on a few factors.

How Much Do New Windows Cost?

The national average cost to install a single window is about $600 but can range anywhere from $200 to $1,200. These figures vary based on specific characteristics of your installation, including number of windows, type, size, the location of your home, material and more.

Whether or not you pick energy-efficient windows is another factor that will affect the cost. These will typically cost more than other windows, but on the other hand, you can save about $423 a year on your energy bills in Candia.

How much your window installation costs will also vary based on the kind of window material you choose for the frames. Wood windows are typically the most expensive, although it depends if they are completely wood or clad with aluminum or vinyl. Fiberglass windows also tend to be a bit more expensive than vinyl, but they are more efficient.

What Services do Window Installers Offer?

Generally, there are two kinds of window installation services companies offer: full-frame and pocket installations.

Full-frame installations involve replacing the full window, including the sill, frame and trim. You most likely need a full-frame installation when you want a new style or your window has noticeable damage. Full-frame installations are more involved and will increase the total cost. Pocket installations are simpler and won't carry as large a bill because they involve simply replacing the window within its existing frame. But if the frame has any damage or rot, you may need a full-frame installation instead.

If you're still trying to decide which type of installation you should get, you can talk to your provider and get their recommendation. The decision mostly is influenced by the age of your window frames and if there's any damage present.

Best Affordability

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Lifetime warranty
  • Low prices relative to competitors
  • Quality of service will depend on your area

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Award-winning company
  • Manufactures products in-house
  • More expensive than competition

Best for Businesses

Aeroseal Windows

★★★★★
4

  • Manufactures products in-house
  • Many years of experience
  • Great industry reputation
  • Not ideal for residential installations

How We Choose the Best Window Installers in Candia

In our hunt to make your home improvements easier and more eco-friendly in Candia, the EcoWatch team chose the above companies as the best window installation companies in the city. We have decided to evaluate the best window installers in Candia mostly based on energy efficiency, as it's the most sustainable option and the best one for homeowners. Energy Star certified windows have been shown to lower electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology considers the following factors:

Service Area

This one is self-explanatory, but we've chosen to highlight window installation companies that serve Candia so you can find a quality window installation company near you.

Work Quality

When it comes to new windows, the quality and range of services often plays just as important of a role in insulation and performance as the brand you choose. 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

Customer feedback is another super important review factor. If most customers don't have good feedback about their service from a certain installer, it won't be featured on EcoWatch.

Cost

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

Warranty

As discussed, windows are a significant investment, so you'll want to be certain that investment is well protected. Window installation companies that provide lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

Years of Experience

Due to Candia's climate, homeowners will want to mitigate water damage, rot and low efficiency. We factored in local experience to reflect the ability of Candia window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.

Candia, NH Window Replacement FAQs

What is the average cost to install windows?

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

What are the most common kinds of replacement windows?

There are several different types of windows you can get for your house, including transom windows, picture windows, slider windows, casement windows, bay windows, double-hung and single-hung windows and awning windows.

When do I have to use a window installation company?

You should hire a window installation professional whenever you need new windows. Installing windows is a involved process that can take a lot of time, so it's best left to the professionals.

When is the best time of year to replace windows?

Replacement windows can be installed at any time, but autumn might be the best season. No matter when you install them, the contractors will take steps to make sure that too much hot or cold air doesn't get into your house, so the temperature outside doesn't necessarily matter that much. What's more important than the temperature is that the weather should be dry.

When is it 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 probably need to 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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