21 Best Window Replacement Companies in Brea, CA (Feb 2023)
Window Companies Near Me

Are you looking to upgrade your windows? Our list of the top window installation companies can help you choose the right one for you.

We analyzed all the top window installers in Brea 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.

Whether you're doing home renovations or have damaged windows, windows play a key role in conserving electricity in your home. During the hot summer months, the last thing you want is your cool air to leak out of your drafty windows.

Thankfully, saving you money with more efficient windows also helps our goals of reducing energy usage for the environment.

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

Excellent Reputation

Milgard Windows & Doors

★★★★★
4.5

  • EnergyStar Partner
  • Wide network of installers
  • Lifetime warranty available
  • Limited additional services

Best Overall

Renewal by Andersen

★★★★★
4.5

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

Best Affordability

Window World

★★★★★
4.5

  • Large serice area
  • Lifetime warranty
  • Great industry reputation
  • Quality of service will depend on your area

Best Window Replacement Companies in Brea

The EcoWatch team assessed dozens of providers that service the Brea area to find the best window installation companies by our standards. The companies we've included in this article scored best in our categories: energy-efficient offerings, availability, price, customer service and more.

Milgard Windows & Doors logo
FAST QUOTE
as little as 30 seconds
Excellent Reputation

Milgard Windows & Doors

★★★★★
BBB Rating: A
Locations: West Coast
Founded: 1962
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Wide network of installers
  • Pros icon Lifetime warranty available
Cons:
  • Pros icon Limited additional services

Milgard Windows & Doors provides the best local installation in Brea. It's a family-owned and -operated window replacement company, which primarily serves the West Coast. Milgard has around 60 years of industry experience, and it currently provides services to Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties. Many positive reviews on customer review websites back the company's reputation.

You may want to consider choosing Milgard if you're interested in a installer that offers competitive pricing, a comprehensive warranty and installers that all have a minimum of 15 years of window installation experience.

Energy Efficiency of Milgard Windows & Doors Windows

There are a wide variety of window types that Milgard Windows & Doors offers, some of which are Energy Star products. The company manufactures its own products, which gives it the freedom to make custom windows based on the climate. The company designs its own vinyl compounds and profiles to ensure a heat-stable product that performs as advertised.

How much does Milgard Windows & Doors cost in Brea?

Milgard does not display prices on its website, but it offers different kinds of windows at varying price points. The best way to know for sure is to receive a free 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 Member of US Green Building Council
  • Pros icon Great industry reputation
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty

Renewal by Andersen has the best availability in Brea. Andersen has been in the window business for about 27 years. Hundreds of positive reviews from customers online back the company's reputation.

It 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

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. Not all of Andersen's offerings are Energy Star certified, so make sure you mention that you want Energy Star windows when inquiring.

How much does Renewal by Andersen cost in Brea?

Although prices are 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. For more accurate information on the cost, you can get a quote from the company.

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 Great industry reputation
Cons:
  • Pros icon Quality of service will depend on your area

Window World has windows expertise in Brea. This provider has 27 years of experience in the windows business, and it has established itself as one of the most respected companies in Brea. Hundreds of positive reviews from customers online back the provider's reputation.

You may want to consider opting for Window World if you're interested in 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

Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World's offerings are Energy Star certified, so be sure to mention that you'd like Energy Star windows when inquiring.

How much does Window World cost in Brea?

Window World doesn't have any cost information available on its website, but it's known for offering some of the most affordable window installations around. If you'd like more accurate 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 offers the best warranty in Brea. Universal has about 20 years of experience in the window replacement business. Its reputation is backed by many positive reviews on customer review websites.

Universal may be the company for you if you want one that has an industry-leading warranty covering products, parts and workmanship for life.

Energy Efficiency of Universal Windows Direct Windows

There are a wide variety of window types that Universal Windows Direct offers, some of which are Energy Star products. 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.

How much does Universal Windows Direct cost in Brea?

Universal doesn't have any pricing information available 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 inquire about a quote from the company.

We've recommended companies with good reputations, but bear in mind that these are national companies, so the quality of service may depend on your local crew. We have tried to be unbiased and transparent by mentioning pros and cons for every company we reviewed.

More Window Replacement Companies in Brea

The Glass Guru

Torrance, CA
4.8
★★★★★
  • Pros icon Consistent Workmanship
  • Pros icon Reliable Appointment Windows
  • Pros icon No-fee Quotes
  • Pros icon Educational Website

Services Offered

  • 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://theglassguru.com/locations/torrance-ca/
Address: 20934 Normandie Ave, Torrance, CA 90502
Phone: (888) 509-2440

Economy Glass Co West Inc

Santa Monica, CA
4.6
★★★★★
  • Pros icon Reliable Appointment Windows
  • Pros icon No-fee Quotes
  • Pros icon Excellent Customer Service
  • Pros icon Dependable Service

Services Offered

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

Website: https://economyglasscowest.com/
Address: 1631 Colorado Ave, Santa Monica, CA 90404
Phone: (310) 396-2000

Broadway Glass & Mirror, Inc.

Long Beach, CA
4.6
★★★★★
  • Pros icon Reliable Service
  • Pros icon Good Customer Service
  • Pros icon Reliable Appointment Windows
  • Pros icon No-Hassle Pricing

Services Offered

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

Website: http://www.broadwayglass.com/
Address: 2523 E Broadway, Long Beach, CA 90803
Phone: (562) 434-8405

Smart Window Company

Torrance, CA
4.3
★★★★★
  • Pros icon Educational Website
  • Pros icon Dependable Service
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • 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: https://smartwindowcompany.com/
Address: 2291 W 205th St Suite 106-A, Torrance, CA 90501
Phone: (310) 946-3697

A New View Windows & Doors Inc.

Anaheim, CA
4.3
★★★★★
  • Pros icon Dependable Service
  • Pros icon Price Transparency
  • Pros icon Free Quotes
  • Pros icon Arrives on Time

Services Offered

  • Service icon Glass Showers
  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.anewviewwindows.com/
Address: 3445 E La Palma Ave, Anaheim, CA 92806
Phone: (714) 953-7663

Eisenbart & Sons Glass, Windows & Doors

Mission Viejo, CA
4.2
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Free Quotes

Services Offered

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

Website: http://www.eisenbartandsons.com/
Address: 23725 Vía Fabricante D, Mission Viejo, CA 92691
Phone: (949) 768-5733

Select Home Improvements

Anaheim, CA
4.2
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Service
  • Pros icon Helps Educate Customers
  • Pros icon Arrives on Time

Services Offered

  • Service icon Residential Windows
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://selecthi.com/
Address: 1220 N Fee Ana St, Anaheim, CA 92807
Phone: (855) 405-2426

Metropolitan High Performance Windows

Anaheim, CA
4.1
★★★★★
  • Pros icon Reliable Service
  • Pros icon Arrives on Time
  • Pros icon Educational Website
  • Pros icon No-fee Quotes

Services Offered

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

Website: https://www.mhiwindows.com/
Address: 940 E Orangethorpe Ave g, Anaheim, CA 92801
Phone: (800) 995-8878

Golden Glass

Fullerton, CA
4.1
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Heavy Glass
  • Service icon Tempered Glass
  • Service icon Doors
  • Service icon Custom Window Designs
  • Service icon Business Windows
  • Service icon Double-Hung

Website: https://goldenglass.com/
Address: 1221 E Orangethorpe Ave, Fullerton, CA 92831
Phone: (714) 449-8989

Veracity Window and Door

Riverside, CA
4.0
★★★★★
  • Pros icon Dependable Service
  • Pros icon Price Transparency
  • Pros icon Arrives on Time
  • Pros icon Excellent Customer Service

Services Offered

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

Website: http://www.veracitywindowanddoor.com/
Address: 1531 Seventh St, Riverside, CA 92507
Phone: (866) 252-2904

Devina Home Remodeling Orange County

Laguna Hills, CA
4.0
★★★★★
  • Pros icon Locally Recognized for Quality
  • Pros icon Helps Educate Customers
  • Pros icon Excellent Customer Service
  • Pros icon Free Quotes

Services Offered

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

Website: https://www.google.com/aclk
Address: Laguna Hills, CA
Phone: (714) 357-7156

Tashman Home Center

West Hollywood, CA
3.9
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Educational Website
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency

Services Offered

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

Website: https://www.tashmans.com/
Address: 7769 Santa Monica Blvd, West Hollywood, CA 90046
Phone: (323) 909-6553

Anaheim Glass

Anaheim, CA
3.9
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Locally Recognized for Quality
  • Pros icon Consistent Workmanship

Services Offered

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

Website: http://anaheimglass.com/
Address: 542 S Anaheim Blvd, Anaheim, CA 92805
Phone: (714) 535-4940

California Window Masters

Irvine, CA
3.9
★★★★★
  • Pros icon Arrives on Time
  • Pros icon Educational Website
  • Pros icon Consistent Workmanship
  • Pros icon Price Transparency

Services Offered

  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Residential Windows
  • Service icon Sliding Glass

Website: https://californiawindowmasters.com/los-angeles/
Address: 2102 Business Center Dr STE 130, Irvine, CA 92612
Phone: (855) 464-7665

Bodie's Glass Service

Westminster, CA
3.8
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Service
  • Pros icon Educational Website
  • Pros icon No-Hassle Pricing

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.bodiesglass.com/
Address: 5722 Westminster Blvd., Westminster, CA 92683
Phone: (714) 898-4602

Window King

Huntington Beach, CA
3.8
★★★★★
  • Pros icon Educational Website
  • Pros icon No-fee Quotes
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Service

Services Offered

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

Website: https://www.windowkingla.com/
Address: 419 Main St Suite # B, Huntington Beach, CA 92648
Phone: (562) 372-0219

Tesla Windows

Buena Park, CA
3.8
★★★★★
  • Pros icon Reliable Service
  • Pros icon Timely Service
  • Pros icon Excellent Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

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

Website: http://www.teslawindows.com/
Address: 5300 Beach Blvd suite 110-524, Buena Park, CA 90621
Phone: (562) 674-0544

Anytime Windows and Doors

North Hollywood, CA
3.8
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Consistent Workmanship
  • Pros icon Excellent Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Fast Delivery
  • Service icon Energy-Efficient Options
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Sliding Glass

Website: http://anytimewindowsanddoors.com/
Address: 10746 Burbank Blvd Suite B, North Hollywood, CA 91601
Phone: (866) 755-6996

Design Windows and Doors Inc.

Ontario, CA
3.8
★★★★★
  • Pros icon Reliable Service
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency
  • Pros icon Reliable Appointment Windows

Services Offered

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

Website: https://www.designwindowsinc.com/
Address: 504 S Mountain Ave, Ontario, CA 91762
Phone: (909) 377-4447

GOLDEN BEAR GLASS & WINDOWS LLC

Los Angeles, CA
3.8
★★★★★
  • Pros icon Consistent Workmanship
  • Pros icon Good Customer Service
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Heavy Glass
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Business Windows

Website: http://www.glassinstalls.com/
Address: 3311 W 3rd St # 421, Los Angeles, CA 90004
Phone: (310) 933-2600

American Window Company

Covina, CA
3.7
★★★★★
  • Pros icon Free Quotes
  • Pros icon Arrives on Time
  • Pros icon Locally Recognized for Quality
  • Pros icon Helps Educate Customers

Services Offered

  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Energy-Efficient Options

Website: https://www.americanwindowcompany.com/
Address: 803 N Glendora Ave, Covina, CA 91724
Phone: (626) 967-4043

How Installing Energy-Efficient Windows in Brea Saves You Money

Energy-efficient windows can provide benefits in several ways. Here are some reasons you may want to make the switch:

  • 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, drafty or maybe even damaged in some way. Updating your windows could help raise the value of your home if you decide to sell.
  • Save on energy bills: Switching to energy-efficient windows lowers your energy bills by about 12% because you use less energy.
  • Reduce your carbon footprint: By using less energy after you switch to Energy Star certified windows, you'll also be lowering your indirect greenhouse gas emissions by about 12%, according to Energy Star.
  • Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent your floors, carpets and furniture from fading by filtering out UV rays.

Estimated Cost of Window Replacement in Brea

When looking into window installation, each company provides different services and costs. Let's go over some typical costs and services.

How Much Do New Windows Cost?

According to our market research, the typical cost of installing a single window is around $600. However, window replacement costs can range from $200 to $1,200 per window. This is because of the fact that the cost of window installations are based on several factors specific to your home, like the size, material and number of windows you need to replace, as well as where your property is located.

Bear in mind that energy-efficient windows may have a higher price, but Energy Star estimates the upgrade will save you between $101 and $583 per year when replacing single-pane windows and between $27 and $197 per year when replacing double-pane, clear glass windows. These savings vary based on your local climate, energy rates and individual home characteristics.

Another factor that affects the total cost is the material you select for your frame. Aluminum frames are typically the least expensive and are sturdy and relatively maintenance-free, but they provide poor insulation. On the other hand, wood frames are the most expensive, as they are aesthetically pleasing and provide decent insulation. Fiberglass and vinyl frames provide good insulation and cost somewhere between the other two.

What Services do Window Installers Offer?

The first thing to ask yourself when considering a window replacement is: Do you want a full-frame installation or a pocket installation?

Full-frame installations are usually done when you want a new style or your window has a lot of rot. With this service, your installers will replace the whole window, including the trim, sill and frame. A pocket installation means replacing a window without removing the complete frame, which is usually less expensive than a full-frame installation.

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

Excellent Reputation

Milgard Windows & Doors

★★★★★
4.5

  • EnergyStar Partner
  • Wide network of installers
  • Lifetime warranty available
  • Limited additional services

Best Overall

Renewal by Andersen

★★★★★
4.5

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

Best Affordability

Window World

★★★★★
4.5

  • Large serice area
  • Lifetime warranty
  • Great industry reputation
  • Quality of service will depend on your area

How We Choose the Best Window Installers in Brea

EcoWatch reviews are different from most reviews since we're examining these companies through a sustainability lens. We have assessed the best window installation companies in Brea primarily based on their energy efficient offerings, as the most sustainable option also benefits homeowners in many ways. Energy Star certified windows have been shown to cut your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology is based on the following factors:

Service Area

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

Work Quality

When selecting new windows, the quality and range of services often plays just as important of a role in insulation and performance as the brand of window you opt for. We do give window installers higher marks 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 the majority of customers don't have nice feedback about their service from a certain installer, you won't see it featured on EcoWatch.

Cost

Cheaper windows don't necessarily mean better windows, but we know many of our readers would like to keep costs low when 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. That's why window installation companies that give you 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 good track record in the industry. Window installers that have more experience will earn higher rankings by our standards. We like to see at least ten years of experience.

Brea, CA Window Replacement FAQs

How much should a window install cost?

The national average cost to install a single window is around $600 but can range from $200 to $1,200, depending on a variety of factors. The price is usually influenced by the size of the window, the location of your property and the type and material of the window. Also, keep in mind that energy-efficient windows may cost more upfront but can save you hundreds of dollars a year in energy bills.

What are the different types of windows?

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

Do I really have to use a window installation company?

Unless you have experience with home improvement projects and have the time needed to replace your own windows, we recommend hiring the pros. The process of installing windows is quite involved and can take anywhere from four to six hours for a single window. Although it's tempting to try to save some money by doing it yourself, hiring a professional is a faster, more efficient and much safer option.

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. Other than that, if your windows have any damage on them, or they have become difficult to open or close, they may be in need of replacement.

Should I replace all my windows at the same time?

If you're upgrading your windows to save on your energy bills, replacing all your windows at the same time is the only way to gain that benefit. On the other hand, if you have only a few windows that are damaged or drafty, you can replace just those.

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