20 Best Window Companies in North Bethesda, MD (2024 Reviews)

Thinking about improving your home’s insulation? The top window replacement companies can help.

We analyzed all the top-rated window companies in North Bethesda and selected the best 20 based on:

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

By EcoWatch Local Advisors

Updated April 21, 2024

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 top window installation companies in North Bethesda may not seem like the most captivating article on the EcoWatch site, but trust us, windows impact your life more than you might think. When it’s the middle of summer, your old and drafty windows could be making your home more difficult to cool and more uncomfortable for you.

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

Unlike other review sites, EcoWatch ranks window companies on energy efficiency while also taking into consideration cost, customer satisfaction and service area.

Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house
Buy One Window, Get One 40% OFF
Get Estimate

Best Energy-Efficient Features

Champion

★★★★★
4.5
  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty
Buy 2 Windows, Get 2 Free
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

Best Window Installation & Replacement Companies in North Bethesda

The EcoWatch team evaluated several installers in North Bethesda to find the best ones for our readers. The providers we’ve mentioned in this article passed our review standards for energy-efficient offerings as well as customer service, local expertise, price 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 EnergyStar Partner
  • Pros icon Large serice area
  • Pros icon Low prices relative to competitors
  • Pros icon Great industry reputation
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Quality of service will depend on your area

Window World provides windows expertise in North Bethesda. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window industry for about 27 years.

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, Window World may be the right company for you.

Energy Efficiency of Window World Windows

Window World offers 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. 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 North Bethesda?

Window World doesn’t have any pricing information listed on its website, but it's known for offering some of the most affordable window installations around. You can request a free quote on its website for more information about pricing.

Renewal by Andersen logo
FAST QUOTE
as little as 30 seconds
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty
  • Pros icon More expensive than competition

Renewal by Andersen provides the best availability in North Bethesda. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window industry for about 27 years.

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 offers 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. 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 North Bethesda?

Andersen doesn’t have any pricing information listed 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. You can request a free quote on its website for more information about pricing.

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 Many years of experience
  • Pros icon Great industry reputation
  • Pros icon Low number of customer complaints
  • Pros icon Manufactures products in-house
  • Pros icon Custom Designs
Cons:
  • Pros icon No lifetime warranty
  • Pros icon Not ideal for residential installations

Aeroseal Windows provides the best window installation for businesses in North Bethesda. It's 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 been in the window industry for about 23 years.

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

Energy Efficiency of Aeroseal Windows Windows

Aeroseal Windows offers 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 North Bethesda?

Aeroseal doesn’t have any pricing information listed 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 pricing.

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 provides the best residential windows in North Bethesda. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has been in the window industry for about 16 years.

If you’re looking for a company that gives customers the opportunity to view products and to speak to a representative in person in its showrooms, Window Nation may be the right company for you.

Energy Efficiency of Window Nation Windows

Window Nation offers 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. Each product has windowpanes coated with a Low-E (low emissivity) glaze that prevents damaging UV rays from heating your home. Plus, the spaces between double- and triple-pane windows are filled with argon gas that’s been proven to improve home insulation.

How much does Window Nation cost in North Bethesda?

Window Nation doesn’t have any pricing information listed on its website, but based on customer feedback, you can expect to pay between $300 and $525 per window installed, making it a more affordable option compared to competitors. You can request a free quote on its website for more information about pricing.

We’ve recommended installers with shining reputations, but keep in mind some national companies have independently owned locations in North Bethesda, so the quality of service may vary depending on your local crew. We have tried to be unbiased and transparent by describing pros and cons for every company reviewed.

More Window Companies in North Bethesda

Renewal by Andersen of the Capital Region

North Bethesda, MD
4.9
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors
  • Service icon Skylights

Website: https://www.renewalbyandersen.com/window-company/085-capital-region/about-us
Address: 5081 Nicholson Ln, North Bethesda, MD 20852
Phone: (301) 816-3221

Champion Replacement Windows of Baltimore

Rosedale, MD
3.2
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Glass Doors
  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Window Replacement/Installation

Website: https://www.championwindow.com/Baltimore/
Address: 23 Fontana Ln, Rosedale, MD 21237
Phone: (410) 202-8636

Window World of Washington DC

Chantilly, VA
4.1
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Vinyl Frames
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Bay Windows

Website: https://www.windowworlddc.com/
Address: 4116 Walney Rd Suite J, Chantilly, VA 20151
Phone: (703) 378-7999

Window Nation

Lorton, VA
4.4
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Bay Windows
  • Service icon Custom Window Designs
  • Service icon Vinyl Frames
  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung
  • Service icon Glass Doors

Website: https://www.windownation.com/northern-va-showroom
Address: 8198 Terminal Rd #105, Lorton, VA 22079
Phone: (703) 372-4540

KELEMER BROTHERS REPLACEMENT WINDOWS

Silver Spring, MD
5.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options

Website: http://www.kelemerbrothers.com/
Address: 10822 Childs Ct, Silver Spring, MD 20901
Phone: (410) 299-0038

Safety Window Glass Repair LLC

Bethesda, MD
4.9
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Tempered Glass
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors
  • Service icon Glass Showers
  • Service icon Glass Repair
  • Service icon Skylights
  • Service icon Bay Windows
  • Service icon Custom Glass
  • Service icon Window Repair
  • Service icon Double-Hung
  • Service icon Mirrors
  • Service icon Energy-Efficient Options
  • Service icon Triple Pane Glass

Website: https://safetywindowglassrepair.com/
Address: 7529 Spring Lake Dr Unit C1, Bethesda, MD 20817
Phone: (202) 460-8860

Pella Windows & Doors of Gaithersburg

Gaithersburg, MD
4.9
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Window Replacement/Installation
  • Service icon Wood Frames
  • Service icon Glass Doors

Website: http://www.pellabranch.com/washington-dc/showrooms/gaithersburg
Address: 202 Perry Pkwy Suite 6, Gaithersburg, MD 20877
Phone: (202) 810-6722

Pella Windows & Doors of Tysons Corner

Vienna, VA
4.9
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Double-Hung
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Wood Frames
  • Service icon Vinyl Frames

Website: http://www.pellabranch.com/northern-virginia/showrooms/vienna/
Address: 8150 Leesburg Pike Suite 140, Vienna, VA 22182
Phone: (301) 354-3689

Window and Door Showplace Inc

McLean, VA
4.1
★★★★★
  • Pros icon Educational Website
  • Pros icon Timely Service
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors
  • Service icon Double-Hung

Website: http://www.wdshowplace.com/
Address: 6832 Old Dominion Dr Suite 103, McLean, VA 22101
Phone: (703) 506-3650

American Home Center Inc.

Beltsville, MD
4.5
★★★★★
  • Pros icon Timely Service
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Glass Doors
  • Service icon Fiberglass Frames
  • Service icon Wood Frames
  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation
  • Service icon Vinyl Frames

Website: https://www.ahc-inc.net/
Address: 10778 Tucker St, Beltsville, MD 20705
Phone: (301) 220-1144

Tri County Windows and Siding

Vienna, VA
5.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Skylights
  • Service icon Bay Windows

Website: http://www.tricountywindowsva.com/
Address: 200 Lawyers Rd NW #1629, Vienna, VA 22183
Phone: (703) 472-6330

Capital Remodeling, Inc.

Gaithersburg, MD
3.9
★★★★★
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Vinyl Frames

Website: http://www.capitalremodeling.com/
Address: 555 Quince Orchard Rd #210, Gaithersburg, MD 20878
Phone: (800) 310-7154

Pella Windows & Doors of Beltsville

Beltsville, MD
4.7
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung

Website: https://www.pellabranch.com/annapolis/showrooms/beltsville/
Address: 12100 Baltimore Ave #1, Beltsville, MD 20705
Phone: (301) 685-1715

Hodges Windows & Doors

Falls Church, VA
4.3
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Bay Windows
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Window Replacement/Installation

Website: http://www.hodgescompany.com/
Address: 120 W Jefferson St, Falls Church, VA 22046
Phone: (703) 532-0184

Quality Window & Door Inc

Beltsville, MD
4.7
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Educational Website

Services Offered

  • Service icon Glass Doors
  • Service icon Window Replacement/Installation
  • Service icon Double-Hung
  • Service icon Metal Frames
  • Service icon Custom Window Designs
  • Service icon Wood Frames

Website: https://www.qualitywindowanddoorinc.com/
Address: 6700 Distribution Dr, Beltsville, MD 20705
Phone: (301) 960-5864

Gaithersburg Glass Company

Gaithersburg, MD
3.8
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Custom Window Designs
  • Service icon Mirrors
  • Service icon Storm/Impact Windows
  • Service icon Energy-Efficient Options
  • Service icon Glass Showers
  • Service icon Custom Glass
  • Service icon Glass Doors

Website: http://www.gburgglass.com/
Address: 19200 Chennault Way, Gaithersburg, MD 20879
Phone: (301) 948-2623

Window Replacement DC - Reston

Reston, VA
5.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Good Customer Service

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Skylights
  • Service icon Custom Window Designs
  • Service icon Mirrors
  • Service icon Energy-Efficient Options
  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Window Repair
  • Service icon Wood Frames
  • Service icon Glass Showers
  • Service icon Fiberglass Frames
  • Service icon Vinyl Frames
  • Service icon Glass Repair
  • Service icon Glass Doors
  • Service icon Storm/Impact Windows

Website: https://window-replacement-dc.com/reston/
Address: 1890 Preston White Dr #383, Reston, VA 20191
Phone: (702) 703-3190

Homefix Custom Remodeling

Laurel, MD
4.5
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Glass Doors

Website: https://homefixcustomremodeling.com/columbia-md/
Address: 14880 Sweitzer Ln STE B, Laurel, MD 20707
Phone: (410) 346-3996

Supreme Window

Hyattsville, MD
4.7
★★★★★
  • Pros icon Educational Website
  • Pros icon Free assessment
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Good Customer Service

Services Offered

  • Service icon Custom Window Designs
  • Service icon Window Replacement/Installation

Website: https://supreme-window.com/
Address: 5215 Lawrence Pl, Hyattsville, MD 20781
Phone: (301) 322-3450

Blaine Window & Door

Silver Spring, MD
3.3
★★★★★
  • Pros icon Price Transparency

Services Offered

  • Service icon Window Replacement/Installation

Website: http://www.blainewindowanddoor.com/
Address: 2410 Linden Ln, Silver Spring, MD 20910
Phone: (301) 565-4949
North Bethesda Window Cost Calculator

Calculate how much you can expect to pay for window installation and replacement in North Bethesda, MD using our customized window cost calculator.

Estimated Window Cost:
161 homeowners have requested a free estimate in the last 3 days.

Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.

How Installing Energy-Efficient Windows in North Bethesda Saves You Money

Upgrading to energy-efficient windows can improve the comfort of your home and help you save on power bills. Here's more information on how upgrading your windows could benefit you:

  • Decrease your carbon footprint: Decreasing the amount of energy you use also lowers your carbon emissions. You could reduce it by about 234 pounds.
  • Protect your investment: The older your home is, the more likely you are to benefit from switching to energy-efficient windows. Older homes usually have windows that are outdated, leaky or potentially even damaged in some way. Updating your windows could help increase the value of your home if you decide to sell.
  • Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only insulate your home better, but also filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
  • Save money on electricity bills: According to the Department of Energy, heat gained or lost through windows accounts for around 25-30% of household energy use. Replacing your windows with energy-efficient models can help reduce that number, therefore saving you about 12% more on your bills.

Estimated Cost of Window Replacement in North Bethesda

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

How Much Do New Windows Cost?

The typical cost to install a single window is about $600 but can range anywhere from $200 to $1,200. But costs will vary considerably based on the quality of your products, the current condition of your home, the number of windows you need and your location. A lot of window companies also offer door installations and other add-ons like shutters, coating, baths and more. Additional services will increase your overall project costs.

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 $294 a year on your energy bills in North Bethesda.

Another factor that influences the total cost is the material you select for your frame. Aluminum frames are generally the least expensive and are sturdy and light, 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?

There are typically two kinds of window replacement services: full-frame and pocket installations.

Full-frame installations involve replacing the total window, including the frame, trim and sill. Full-frame installations are necessary when you want a new style or your window has considerable deterioration. Because these installations are more involved, they will increase the overall cost. A pocket installation entails replacing a window without taking out the entire frame, which is generally cheaper than a full-frame installation.

Your window installation company can help you figure out which type of installation you should get.

Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great industry reputation
  • Member of US Green Building Council
  • Manufactures products in-house
Buy One Window, Get One 40% OFF
Get Estimate

Best Energy-Efficient Features

Champion

★★★★★
4.5
  • Many years of experience
  • Low prices relative to competitors
  • Limetime warranty
Buy 2 Windows, Get 2 Free
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

How We Choose the Best Window Installers in North Bethesda

The EcoWatch Reviews team is different from other reviewers, as we look at these companies through a sustainability lens. Along with energy efficiency, we analyzed each installer and ranked them based on the following methodology:

Service Area

Since this is a guide for North Bethesda, we only included 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 North Bethesda.

Work Quality

We’re willing to bet that you’re looking for professionals who do a great job installing windows. We’ve vetted each installer included in our guide to make sure its technicians are well-qualified and that the company has received tons of positive customer feedback to vouch for its service.

Customer Reviews

We analyzed patterns in recent online reviews to determine the companies with the most consistent 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 cost, professionalism, warranty, quality of parts, quality of installation and more.

Cost

Cheaper windows certainly don’t mean better windows, but we know many of our readers try 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

Protecting your investment in new windows is important. For that reason, window installation companies that provide lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

Years of Experience

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

North Bethesda, MD Window Replacement FAQs

How much should window installation cost?

The national average cost of replacing a single window is around $600 but can range between $200 and $1,200, depending on a variety of factors. The price is usually influenced by the type and material of the window, the size of the window and the location of your property. Also, bear in mind that energy-efficient windows may cost more initially but can save you a decent amount of money a year in energy bills.

Which kind of window is the best?

A window’s energy efficiency is affected by a number of factors, such as the quality of the installation and the kind of window. Look for Energy Star Certified windows — these are typically the most energy-efficient and are certified by the U.S. Department of Energy.

Can you replace your own windows?

While it is possible to install your own windows, doing so is time-consuming and requires a lot of handiness. Using a window installation company can help ensure that the installation is done properly and that you won’t have to spend the time and effort to do it yourself.

Should I replace my windows all at once?

If your windows are greater than 20 years old, you probably need to replace all of them. At that point, they are often less efficient, draftier and/or more damaged than new windows. Doing your windows all at once will involve less paperwork and less stress.

How long does it usually take to install windows?

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