21 Best Window Replacement Companies in Ofallon, MO (Jan 2023)
Window Companies Near Me

Looking to improve your home's energy efficiency? The top window replacement companies can help.

We analyzed all the top window installers in Ofallon and selected the top 21 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 guide on the top window installation companies in Ofallon may not seem like the most riveting article on the EcoWatch site, but trust us, windows have more of an impact on your life than you might realize. The Department of Energy estimates that heat or cool air lost through outdated or drafty windows could make up about 30% of heating and cooling costs. In Ofallon, where the power bills are an average of $39 per month, that's almost $$140 per year wasted.

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

As windows are so important for your home, selecting the best company for you is a big choice to make. That's why the EcoWatch team has created this list of the top window installation companies, so you can make an informed decision more easily.

Best Affordability

Window World

★★★★★
4.5

  • Large serice area
  • Lifetime warranty
  • EnergyStar Partner
  • Quality of service will depend on your area

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house
  • No lifetime warranty

Best Warranty

Universal Windows Direct

★★★★★
4

  • Lifetime warranty
  • Makes charitable contributions
  • Wide variety of products and services
  • Some installations carried out by third-party contractors

Best Window Replacement Companies in Ofallon

The EcoWatch team evaluated several window companies in Ofallon to find the best ones for our readers. The providers mentioned in this article passed our review standards for energy-efficient offerings as well as price, local expertise, customer service 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 Large serice area
  • Pros icon Lifetime warranty
  • Pros icon EnergyStar Partner
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 been in the window business for around 27 years. Its reputation is backed by several positive reviews on customer review websites.

If you're looking for a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital, this may be the perfect company for you.

Energy Efficiency of Window World Windows

Window World has some Energy Star windows, but note that not all its windows are energy-efficient, so make sure you mention that you want 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 Ofallon?

Although prices are not readily available on Window World's website, it's known for offering some of the most affordable window installations around. If you'd like more accurate pricing information, you can ask for 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 Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty

Renewal by Andersen offers the best availability in Ofallon. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. This provider has 27 years of experience in the window installation industry, and it has become one of the best companies in the business.

You may want to consider picking 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 available from Renewal by Andersen, 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 Ofallon?

While pricing is not readily available on Andersen's website, based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. The best way to know for sure is to get a free 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 Lifetime warranty
  • Pros icon Makes charitable contributions
  • Pros icon Wide variety of products and services
Cons:
  • Pros icon Some installations carried out by third-party contractors

Universal Windows Direct offers the best warranty in Ofallon. This company has been in business since 2002 and currently services 27 states nationwide. The provider has hundreds of glowing reviews from customers on online review websites.

It has established itself as a company 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 windows 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 Ofallon?

Prices are not available on Universal's website, as the cost of window installment differs based on how many and what type(s) of windows you need. However, 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. Getting 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 offers the best residential windows in Ofallon. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has around 16 years of industry experience, and it currently provides services to residents within 75 miles of its showrooms, which are in 13 states. Hundreds of positive reviews on customer review websites back the provider's reputation.

It gives customers the opportunity to view products and to speak to a representative in person in its showrooms.

Energy Efficiency of Window Nation Windows

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. Not all of Window Nation's offerings are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.

How much does Window Nation cost in Ofallon?

Even though prices are not available on Window Nation's website, 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 to know for sure, you can get a quote on the company's website.

We strive to stay unbiased and transparent by describing pros and cons for every installer. Additionally, any partnerships do not influence our reviews.

More Window Replacement Companies in Ofallon

The Glass Guru

Wentzville, MO
5
★★★★★
  • Pros icon Locally Recognized for Quality
  • Pros icon Consistent Workmanship
  • Pros icon Reliable Appointment Windows
  • Pros icon Good Customer Service

Services Offered

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

Website: https://www.theglassguru.com/ofallon-mo/
Address: 2182 E Pitman Ave, Wentzville, MO 63385
Phone: (636) 251-4018

Storm Guard Roofing and Construction St Louis West County

Pacific, MO
5
★★★★★
  • Pros icon Reliable Appointment Windows
  • Pros icon No-fee Quotes
  • Pros icon Award-Winning
  • Pros icon Helps Educate Customers

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Aluminum Window Frames
  • Service icon Commercial Windows
  • Service icon Double-Hung
  • Service icon Stained Glass

Website: https://swstlouis.stormguardrc.com/
Address: 114 E Orleans St, Pacific, MO 63069
Phone: (636) 778-9562

Wildwood Roofing & Construction

Ellisville, MO
4.8
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free Quotes
  • Pros icon Locally Recognized for Quality
  • Pros icon Timely Service

Services Offered

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

Website: http://www.wildwoodroof.com/
Address: 437 Old State Rd, Ellisville, MO 63021
Phone: (636) 400-1011

Window World of St. Louis

Bridgeton, MO
4.0
★★★★★
  • Pros icon Arrives on Time
  • Pros icon Price Transparency
  • Pros icon Excellent Customer Service
  • Pros icon Dependable Service

Services Offered

  • Service icon Fast Delivery
  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Aluminum Window Frames
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.windowworldstlouis.com/
Address: 13892 St Charles Rock Rd, Bridgeton, MO 63044
Phone: (314) 993-1800

Chaney Windows And Doors

Maryland Heights, MO
3.9
★★★★★
  • Pros icon Price Transparency
  • Pros icon Award-Winning
  • Pros icon Educational Website
  • Pros icon No-fee Quotes

Services Offered

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

Website: http://chaneywindowsanddoors.com/
Address: 80 Weldon Pkwy, Maryland Heights, MO 63043
Phone: (636) 699-6353

Renewal by Andersen of St. Louis

Maryland Heights, MO
3.8
★★★★★
  • Pros icon Free Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon Educational Website
  • Pros icon Gives to charity

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Full-Service Installations
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://www.rbastl.com/
Address: 2446 Schuetz Rd, Maryland Heights, MO 63043
Phone: (314) 983-9977

Freedom Restoration & Roofing

Warrenton, MO
3.8
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency
  • Pros icon Consistent Workmanship
  • Pros icon Helps Educate Customers

Services Offered

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

Website: https://www.freedomroofingmo.com/
Address: 801 Louis St Suite A, Warrenton, MO 63383
Phone: (636) 275-9494

Empire Supply Co

St. Louis, MO
3.8
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Helps Educate Customers
  • Pros icon Free Quotes
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://empiresupplystl.com/
Address: 7286 Manchester Rd, St. Louis, MO 63143
Phone: (314) 645-2633

Energy View Windows - Home Improvements

Hazelwood, MO
3.7
★★★★★
  • Pros icon Award-Winning
  • Pros icon Excellent Customer Service
  • Pros icon Educational Website
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Double-Hung
  • Service icon Full-Service Installations
  • Service icon Custom Windows
  • Service icon Aluminum Window Frames
  • Service icon Energy-Efficient Options
  • Service icon Architectural Glass

Website: http://www.energyviewhomeimprovements.com/
Address: 7220 N Lindbergh Blvd #350, Hazelwood, MO 63042
Phone: (314) 656-1437

Spectrum Glass & Tinting

O'Fallon, MO
3.6
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free Quotes
  • Pros icon No-Hassle Pricing
  • Pros icon Reliable Service

Services Offered

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

Website: https://www.glassandwindows-mo.com/
Address: 955 W Terra Ln, O'Fallon, MO 63366
Phone: (636) 238-4315

All About Glass

Arnold, MO
3.6
★★★★★
  • Pros icon Price Transparency
  • Pros icon Excellent Customer Service
  • Pros icon Free Quotes
  • Pros icon Reliable Service

Services Offered

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

Website: http://www.allaboutglassstl.com/
Address: 1339 Jeffco Blvd, Arnold, MO 63010
Phone: (636) 461-2900

Masonry & Glass Systems Inc

St. Louis, MO
3.6
★★★★★
  • Pros icon Award-Winning
  • Pros icon No-Hassle Pricing
  • Pros icon No-fee Quotes
  • Pros icon Consistent Workmanship

Services Offered

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

Website: https://www.masonryglass.com/
Address: 1503 S Kingshighway Blvd, St. Louis, MO 63110
Phone: (314) 535-6515

Window Nation

Overland, MO
3.6
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free Quotes
  • Pros icon Price Transparency
  • Pros icon Locally Recognized for Quality

Services Offered

  • Service icon Sliding Glass
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung

Website: https://www.windownation.com/stlouis-showroom/
Address: 1913 Belt Way Dr, Overland, MO 63114
Phone: (314) 279-8249

Sears Window Replacement

Bridgeton, MO
3.6
★★★★★
  • Pros icon Dependable Service
  • Pros icon Free Quotes
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Sliding Glass
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung

Website: https://www.searshomeservices.com/locations/hi/window-replacement/mo/bridgeton
Address: 12930 Hollenberg Dr, Bridgeton, MO 63044
Phone: (314) 325-8649

STL Windows and Doors

St. Louis, MO
3.6
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Appointment Windows
  • Pros icon No-Hassle Pricing
  • Pros icon No-fee Quotes

Services Offered

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

Website: https://stlwindowsanddoors.com/
Address: 12150 Lackland Rd, St. Louis, MO 63146
Phone: (314) 277-5952

Building Envelope Experts

Fenton, MO
3.6
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Reliable Service
  • Pros icon No-fee Quotes
  • Pros icon Arrives on Time

Services Offered

  • Service icon Sliding Glass
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung

Website: https://www.buildingenv.com/
Address: 1576 Fencorp Dr Suite E, Fenton, MO 63026
Phone: (314) 310-7878

Missouri Glass Company

St. Louis, MO
3.4
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Excellent Customer Service
  • Pros icon No-Hassle Pricing
  • Pros icon Timely Service

Services Offered

  • Service icon Residential Windows
  • Service icon Heavy Glass
  • Service icon Tempered Glass
  • Service icon Custom Windows
  • Service icon Commercial Windows

Website: http://www.missouriglass.com/
Address: 1717 Ohio Ave, St. Louis, MO 63104
Phone: (314) 664-5100

Clear Window Technology

Ballwin, MO
3.4
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Free Quotes
  • Pros icon Price Transparency
  • Pros icon Award-Winning

Services Offered

  • Service icon Architectural Glass
  • Service icon Custom Window Designs
  • Service icon Full-Service Installations
  • Service icon Double-Hung
  • Service icon Bay & Bow Windows

Website: http://www.clearwindowtech.com/
Address: 15009 Manchester Rd #267, Ballwin, MO 63011
Phone: (314) 966-2666

Lakeside Renovation & Design

Chesterfield, MO
3.4
★★★★★
  • Pros icon Timely Service
  • Pros icon Educational Website
  • Pros icon Locally Recognized for Quality
  • Pros icon No-Hassle Pricing

Services Offered

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

Website: https://lakesiderenovationanddesign.com/
Address: 139 Chesterfield Industrial Blvd, Chesterfield, MO 63005
Phone: (636) 978-5000

Gateway Glass

10+ years in business · Pacific, MO
3.4
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Fast Delivery
  • Service icon Tempered Glass
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://gateway-glass.com/
Address: 10+ years in business · Pacific, MO
Phone: (636) 271-9898

Alenco Inc.

Fenton, MO
3.3
★★★★★
  • Pros icon Arrives on Time
  • Pros icon Price Transparency
  • Pros icon Helps Educate Customers
  • Pros icon Free Quotes

Services Offered

  • Service icon Custom Window Designs
  • Service icon Glass Showers
  • Service icon Sliding Glass

Website: https://www.alenconline.com/remodelers-st-louis/
Address: 5 Cassens Ct, Fenton, MO 63026
Phone: (314) 480-6264

How Installing Energy-Efficient Windows in Ofallon Saves You Money

By switching to energy-efficient windows, you can enjoy several benefits, such as:

  • Decrease your carbon footprint: You can reduce your indirect greenhouse gas emissions by about 12% after you install Energy Star certified windows. In Ofallon, that's about 763 pounds per year on average.
  • 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.
  • Protect your valuables from fading: When you upgrade to energy-efficient windows with low-emissivity coatings, your floors, carpets and furniture will fade less due to their ability to filter out harmful UV rays.
  • Save on power bills: Since energy-efficient windows decrease how much energy you need to heat or cool your home, they can help you save about $308 annually on your energy bills in Ofallon.

Estimated Cost of Window Replacement in Ofallon

Let's take a look at the cost of window replacement and the kinds of services you may need for your home.

How Much Do New Windows Cost?

According to our market research, the national average cost of installing a single window is about $600. However, window installation costs can range from $200 to $1,200 for each window. These numbers are based on specific characteristics of your installation, like the location of your home, size, type, material, number of windows and more.

Whether or not you want energy-efficient windows is another factor that will determine the cost. These will almost always cost more than other windows, but on the other hand, you can save about $308 a year on your energy bills in Ofallon.

Another factor that influences the overall cost is the material you choose for your frame. Aluminum frames are generally the least pricey and are sturdy and light, but they offer poor insulation. On the other hand, wood frames cost the most, as they are aesthetically pleasing and offer decent insulation. Fiberglass and vinyl frames provide good insulation and cost somewhere between the other two.

What Services do Window Installers Offer?

The first question to ask yourself when planning on installing new windows is: Should you get a full-frame installation or a pocket installation?

A full-frame installation is a total window replacement. It involves taking out the old window, the windowsill, and the exterior and interior trim. It can also involve extra materials, like insulation and drip edges, which raise the overall cost of the project. Also worth noting: you may have to touch up the paint around the window after a full-frame installation. Pocket installations are simpler and won't cost as much because they entail simply replacing the window within its existing frame. But if the frame has any damage or rot, you may have to get a full-frame installation instead.

If you're hiring a reputable window installation company, your company will be able to recommend the best type for your project. In Ofallon, the choice will mostly depend on the efficiency of your home and how old your existing frames are.

Best Affordability

Window World

★★★★★
4.5

  • Large serice area
  • Lifetime warranty
  • EnergyStar Partner
  • Quality of service will depend on your area

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house
  • No lifetime warranty

Best Warranty

Universal Windows Direct

★★★★★
4

  • Lifetime warranty
  • Makes charitable contributions
  • Wide variety of products and services
  • Some installations carried out by third-party contractors

How We Choose the Best Window Installers in Ofallon

In our hunt to find the most reliable, eco-friendly window installers in Ofallon, the EcoWatch Reviews team assessed dozens of companies before landing on these. We've decided to review the top window installation companies in Ofallon primarily based on energy efficiency, as the most sustainable option also benefits homeowners in many ways. Energy Star certified windows can lower power bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:

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

We're certain that you're looking for professionals who do a great job installing windows. We've vetted each installer in our guide to ensure its contractors are well-qualified and that the company has gotten a lot of positive customer feedback to vouch for its service.

Customer Reviews

We analyzed patterns in recent online reviews to find the companies with the highest rates of customer satisfaction, weighted by sample size. Customer satisfaction might be the most important factor, as it reflects the quality of services across most other categories, including quality of parts, cost, professionalism, warranty, quality of installation and more.

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 awarded higher points to companies with reasonable prices and accessible financing rather than "cheaper" services.

Warranty

Protecting your investment in new windows is important. That's why window installation companies that provide lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

Last but not least, we like to see companies that have a proven track record in the industry. Window installation companies that have more experience are going to earn higher rankings by our standards. We like to see at least ten years of experience.

Ofallon, MO Window Replacement FAQs

What is the average cost to replace windows in a home?

The average cost of replacing a window can range between $450 and $650. There are a variety of factors that influence how much it costs, which include your property's location, styles and sizes of windows, how energy-efficient the windows are, the materials used in designing the windows, the number of windows and local labor costs.

What type of window is the most energy-efficient?

A window's energy efficiency is influenced by several factors, including the quality of the installation and what kind of window it is. Look for Energy Star Certified windows — these are usually the most energy-efficient since they are certified by the U.S. Department of Energy.

What do window installers do?

Window installation professionals visit your house to remove your old windows and replace them with new ones. Some providers install products distributed by other companies, whereas others are both manufacturers and installation companies combined. The installer will also clean up after the installation.

When is it time to replace your windows?

Windows generally last about 20 to 30 years, but anytime you see damage on your windows, it's a good time to have an expert take a look at them to determine if they need any repairs or replacements.

Should I replace all my windows at once?

If you're upgrading your windows to get more efficient windows, replacing all the windows at the same time is the only way to see a noticeable difference. However, if you have only one or two windows that are broken or leaky, you can replace just those.

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