21 Best Window Replacement Companies in Mission Viejo, CA (Mar 2023)
Window Companies Near Me

Are you thinking of upgrading your windows? Our guide to the best window installation companies can help you narrow down which one to choose.

We analyzed all the top window installers in Mission Viejo 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 March 14, 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 installation companies in Mission Viejo 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 think. During the hot summer months, the last thing you want is your cool air to leak out of your outdated windows.

That's also bad news for the environment, as the extra energy required by old windows increases your carbon footprint.

Unlike other sites, EcoWatch ranks window installation companies based on energy efficiency while also considering cost, customer satisfaction and service area.

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

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

Best Affordability

Window World

★★★★★
4.5

  • Low prices relative to competitors
  • Lifetime warranty
  • Great industry reputation
  • Quality of service will depend on your area

Best Window Replacement Companies in Mission Viejo

The EcoWatch team examined dozens of installers across the country to find the best window companies for our readers. The companies mentioned in this article scored the best in our review categories, which include energy-efficient offerings, local expertise, customer service, availability, price 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 is a family-owned and -operated window replacement company, which primarily serves the West Coast. This provider has 60 years of experience in the window installation industry, and it has become one of the most respected companies in Mission Viejo.

It 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 range of window types available from Milgard Windows & Doors, 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 Mission Viejo?

Though prices are not available on Milgard's website, it offers different kinds of windows at varying price points. You can request a free quote on its website for more information about the cost.

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 Manufactures products in-house
  • Pros icon Award-winning company
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 around 27 years of experience in the window installation business. Many positive reviews on customer review websites back the company's reputation.

It has established itself as 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

Renewal by Andersen's commitment to sustainability can be seen in its energy-efficient window offerings. A handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019.

How much does Renewal by Andersen cost in Mission Viejo?

Andersen does not outline prices on its website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. The best way to know for sure is to request a free 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 Low prices relative to competitors
  • Pros icon Lifetime warranty
  • Pros icon Great industry reputation
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 about 27 years of experience in the industry, and it currently serves 200 locations nationwide. Its reputation is backed by all the 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 provider for you.

Energy Efficiency of Window World Windows

Window World caters to eco-conscious consumers by providing energy-efficient window offerings. 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 Mission Viejo?

Pricing details are not available on Window World's website, as the cost of window replacement differs based 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. For more detailed information on the cost, you can request a quote from the company.

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

Universal Windows Direct

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

Universal Windows Direct provides the best warranty in Mission Viejo. Universal has about 20 years of experience in the industry, and it currently provides services to 27 states nationwide. Hundreds of positive reviews from customers online back the provider's reputation.

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

There are a wide range 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 Mission Viejo?

Though prices are not readily available on Universal's website, 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. The best way to get more accurate information is to receive a free quote from the company.

We aim to be unbiased and transparent by describing pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.

More Window Replacement Companies in Mission Viejo

The Glass Guru

Temecula, CA
4.7
★★★★★
  • Pros icon Locally Recognized for Quality
  • Pros icon Free Quotes
  • Pros icon Price Transparency
  • Pros icon Educational Website

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

Website: https://www.theglassguru.com/temecula-ca/
Address: 43391 Business Park Dr Ste C-8, Temecula, CA 92590
Phone: (951) 337-4478

Broadway Glass & Mirror, Inc.

Long Beach, CA
4.6
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Arrives on Time
  • Pros icon No-Hassle Pricing
  • Pros icon Consistent Workmanship

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 Business 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

A New View Windows & Doors Inc.

Anaheim, CA
4.3
★★★★★
  • Pros icon Locally Recognized for Quality
  • Pros icon Timely Service
  • Pros icon Helps Educate Customers
  • Pros icon Dependable Service

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 No-Hassle Pricing
  • Pros icon Excellent Customer Service
  • Pros icon Reliable Appointment Windows
  • Pros icon Consistent Workmanship

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

Temecula Glass & Mirror

Temecula, CA
4.2
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Helps Educate Customers
  • Pros icon Reliable Service
  • Pros icon No-fee Quotes

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 Commercial Windows
  • Service icon Sliding Glass

Website: http://www.temeculaglass.com/
Address: 41755 Rider Way Unit #2, Temecula, CA 92590
Phone: (951) 695-5572

Select Home Improvements

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

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 Locally Recognized for Quality
  • Pros icon No-Hassle Pricing
  • Pros icon Dependable Service
  • Pros icon Helps Educate Customers

Services Offered

  • Service icon Fast Delivery
  • Service icon Custom Windows
  • 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 Reliable Appointment Windows
  • Pros icon No-fee Quotes
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Heavy Glass
  • Service icon Tempered Glass
  • Service icon Doors
  • Service icon Custom Windows
  • 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 Helps Educate Customers
  • Pros icon Reliable Service
  • Pros icon Price Transparency
  • Pros icon Free Quotes

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

WindowFits

Murrieta, CA
4.0
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency
  • Pros icon Excellent Customer Service
  • Pros icon No-fee Quotes

Services Offered

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

Website: https://windowfits.com/
Address: 26871 Hobie Cir B6, Murrieta, CA 92562
Phone: (951) 677-2593

All That Glass

San Clemente, CA
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Dependable Service
  • Pros icon Excellent Customer Service
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Windows
  • Service icon Full-Service Installations
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://www.allthatglassshop.com/
Address: 921 Calle Amanecer Suite M, San Clemente, CA 92673
Phone: (949) 276-7906

The Glass Guru

Temecula, CA
4.0
★★★★★
  • Pros icon Free Quotes
  • Pros icon Helps Educate Customers
  • Pros icon Good Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

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

Website: https://www.google.com/aclk
Address: Temecula, CA
Phone: (951) 404-0965

Devina Home Remodeling Orange County

Laguna Hills, CA
4.0
★★★★★
  • Pros icon Reliable Service
  • Pros icon Locally Recognized for Quality
  • Pros icon Educational Website
  • Pros icon Excellent Customer Service

Services Offered

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

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

Andy's Glass & Window Company

Murrieta, CA
3.9
★★★★★
  • Pros icon Dependable Service
  • Pros icon No-Hassle Pricing
  • Pros icon Helps Educate Customers
  • Pros icon Good Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural 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://www.andysglass.com/
Address: 25751 Jefferson Ave, Murrieta, CA 92562
Phone: (951) 677-7421

Anaheim Glass

Anaheim, CA
3.9
★★★★★
  • Pros icon Timely Service
  • Pros icon Free Quotes
  • Pros icon No-Hassle Pricing
  • Pros icon Locally Recognized for Quality

Services Offered

  • Service icon Custom Window Designs
  • Service icon Fast Delivery
  • Service icon Residential Windows
  • Service icon Business 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 Free Quotes
  • Pros icon Reliable Service
  • Pros icon Excellent Customer Service
  • Pros icon Award-Winning

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

A Perfect View Construction

Murrieta, CA
3.8
★★★★★
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Free Quotes

Services Offered

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

Website: https://aperfectviewconst.com/
Address: 26398 Deere Ct STE 107, Murrieta, CA 92562
Phone: (951) 698-2885

Bodie's Glass Service

Westminster, CA
3.8
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Arrives on Time
  • Pros icon No-fee Quotes
  • Pros icon Dependable Service

Services Offered

  • Service icon Glass Showers
  • Service icon Residential Windows
  • Service icon Custom Windows
  • 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 Reliable Appointment Windows
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free Quotes

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 No-Hassle Pricing
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Free Quotes

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • 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

Design Windows and Doors Inc.

Ontario, CA
3.8
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Excellent Customer Service
  • Pros icon Helps Educate Customers
  • 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.designwindowsinc.com/
Address: 504 S Mountain Ave, Ontario, CA 91762
Phone: (909) 377-4447

How Installing Energy-Efficient Windows in Mission Viejo Saves You Money

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

  • 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 potentially even damaged in some way. Updating your windows could help increase the value of your home if you decide to sell.
  • Protect your valuables from fading: When you switch to energy-efficient windows that have low-emissivity coatings, your floors, carpets and furniture will be protected from fading because of their ability to filter out harmful UV rays.
  • Decrease your carbon footprint: By using less energy after upgrading to Energy Star certified windows, you'll also be lowering your indirect greenhouse gas emissions by about 12%, according to Energy Star.
  • Save money on electricity bills: The Department of Energy estimates that heat gained or lost via windows accounts for around 25-30% of household energy use. Installing energy-efficient windows can help decrease that amount, which helps you save $388 a year on your bills.

Estimated Cost of Window Replacement in Mission Viejo

When looking into window installation, each company offers different services and costs. Let's take a look at some typical costs and services.

How Much Do New Windows Cost?

Even though the average of replacing a single window is about $600, it can range from $200 to $1,200. This is because of the fact that window installations are based on a variety of factors specific to your home, like the size, material and number of windows you need to install, as well as where your property is located.

It's important to note that windows with higher efficiency may cost more upfront but can save you hundreds of dollars via returns on your energy bills. Investing in certified energy-efficient windows can save Mission Viejo homeowners $388+ a year when replacing single-pane windows.

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

What Services do Window Installers Offer?

There are generally two kinds of window installation services: full-frame and pocket installations.

A full-frame installation replaces the full window, such as the windowsill, frame, trim and the window panes. Because this type of installation requires more time, it will be more expensive than a pocket installation. Pocket installations (or retrofits) entail installing a new window within the existing frame, which makes pocket installations more simple and affordable. But, if the frame has any rot or deterioration, you should opt for a full-frame installation instead.

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

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

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

Best Affordability

Window World

★★★★★
4.5

  • Low prices relative to competitors
  • Lifetime warranty
  • Great industry reputation
  • Quality of service will depend on your area

How We Choose the Best Window Installers in Mission Viejo

EcoWatch differs from most reviewers since we examine these companies through a sustainability lens. Along with energy efficiency, we evaluated several window installers in Mission Viejo and ranked them based on the following methodology:

Service Area

This one is self-explanatory, but we've chosen to highlight window installers that serve the Mission Viejo area so you can find a quality window installation company near you.

Work Quality

When choosing new windows, the quality and breadth of services often plays just as important of a role in overall efficiency and performance as the brand of window you choose. 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

We analyzed patterns in recent customer feedback to find the companies with the most consistent customer satisfaction. Customer satisfaction might be the factor we place the most value on, as it indicates the quality of services across nearly every category, including cost, warranty, professionalism, quality of parts, quality of installation and more.

Cost

This one is a give-and-take: similar to most services, cheap window companies may not provide the most quality service. Still, we want to ensure we're highlighting companies that provide a wide range of price and financing options so they're accessible to most homeowners.

Warranty

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

Years of Experience

Lastly, we like to see companies that have a good track record in the industry. Window installers that have more experience earn higher rankings by our standards. We like to see at least ten years of experience.

Mission Viejo, CA Window Replacement FAQs

How much does window installation cost?

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

What are the different types of windows?

There are several different kinds of windows you can get for your home, such as awning windows, picture windows, casement windows, transom windows, double-hung and single-hung windows, slider windows and bay windows.

Can you install your own windows?

If you're handy and have the time and patience to do the job right, you may be able to install your own windows. However, if you don't have the time or know-how, we recommend getting a professional to do it for you.

How long does window installation take?

Since the average installation time of a window is 30 minutes, about 16 windows can be installed during a typical 8-hour work day.

What time of year is the best time to replace my windows?

Replacement windows can be installed any time of the year, but autumn might be the best season. Regardless of when you install them, the contractors will take steps to ensure that too much hot or cold air doesn't get into the house, so the temperature outside doesn't necessarily matter that much. What's most important is that the weather should be dry.

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