21 Best Window Replacement Companies in Merrimack, NH (Mar 2023)
Window Companies Near Me
Looking to replace your windows? We've got you covered in this guide to the top window installation companies.
We analyzed all the top window installers in Merrimack and selected the top 21 based on:
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Customer reviews
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Window replacement expertise
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Popularity with home-owners like you
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Updated March 14, 2023
Why you can trust EcoWatch
A review of the top window replacement companies in Merrimack may not seem like the most riveting article on EcoWatch, but trust us, windows impact your life more than you might think. Traditional or damaged windows can cost you in energy bills. As a matter of fact, the Department of Energy estimates that about 30% of your house's heat or cool air could be lost through your windows.
Replacement windows improve your home's insulation, not only making you and your family more comfortable during the summer and winter, but also saving you money and helping the environment.
We've compiled a guide on the best installation companies to help you in your research, so you can not only benefit from brand new windows, but also save money on your power bills.
Best Overall
Renewal by Andersen
- Member of US Green Building Council
- Award-winning company
- Great industry reputation
- More expensive than competition
Best Affordability
Window World
- Lifetime warranty
- Low prices relative to competitors
- EnergyStar Partner
- Quality of service will depend on your area
Best Warranty
Universal Windows Direct
- Manufactures products in-house
- Makes charitable contributions
- Lifetime warranty
- Quality of service will depend on your area
Best Window Replacement Companies in Merrimack
The EcoWatch Reviews team assessed dozens of installers in Merrimack to find the best window installation companies for our readers. The providers we've mentioned in this article passed our review standards for energy-efficient offerings as well as price, customer service, local expertise and beyond.

Renewal by Andersen
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Member of US Green Building Council
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Award-winning company
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Great industry reputation
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More expensive than competition
Renewal by Andersen provides the best availability in Merrimack. Andersen has about 27 years of experience in the industry, and it currently serves nearly every state except Mississippi and West Virginia.
Andersen may be the company for you if you're looking for one 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 WindowsRenewal by Andersen is an Energy Star partner and offers a variety of energy-efficient windows. Note that not all of the company's windows are Energy Star certified, so be sure to ask your Andersen representative when inquiring about services.
How much does Renewal by Andersen cost in Merrimack?Prices aren't available on Andersen's 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 inquire about a free quote on its website for more information about pricing.

Window World
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Lifetime warranty
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Low prices relative to competitors
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EnergyStar Partner
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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 industry for about 27 years. The provider has many positive reviews from customers online.
You may want to consider going with Window World if you're interested in a company 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 WindowsWindow World has some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want high-quality 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 Merrimack?Though prices are not readily available on Window World's website, it's known for offering some of the most affordable window installations around. The best way to get more accurate information is to receive a free quote from the company.

Universal Windows Direct
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Manufactures products in-house
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Makes charitable contributions
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Lifetime warranty
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Quality of service will depend on your area
Universal Windows Direct has the best warranty in Merrimack. It's a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. Universal has about 20 years of experience in the window installation industry. The company has hundreds of glowing reviews from customers on online review websites.
You may want to consider picking Universal if you're looking for a installer that has an industry-leading warranty covering products, parts and workmanship for life.
Energy Efficiency of Universal Windows Direct WindowsThere are a wide variety of window types available from Universal Windows Direct, 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 Merrimack?Prices aren't mentioned on Universal's website, but installations typically range from $225 to $425 per window based on customer feedback. That makes Universal Windows Direct more of a budget-friendly option for window repair and replacements. You can inquire about a free quote on its website for more information about the cost.

Aeroseal Windows
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Many years of experience
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Great industry reputation
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Low number of customer complaints
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Manufactures products in-house
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Custom Designs
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No lifetime warranty
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Not ideal for residential installations
Aeroseal Windows offers the best window installation for businesses in Merrimack. 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. This provider has 23 years of experience in the windows industry, and it has become one of the most reputable companies in Merrimack. The provider has a lot of glowing reviews from customers on online review websites.
If you're looking for a company that installs windows and doors at businesses across the Eastern U.S, this may be the right company for you.
Energy Efficiency of Aeroseal Windows WindowsThe 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. Not all of Aeroseal's offerings are Energy Star certified, so make sure you mention that you'd like Energy Star windows when inquiring.
How much does Aeroseal Windows cost in Merrimack?Aeroseal does not detail prices on its website, but it provides high-quality windows at a competitive price point. If you'd like more accurate information, you can inquire about a quote on the company's website.
We aim to be unbiased and transparent by describing pros and cons for every provider. Additionally, any partnerships do not influence our reviews.
More Window Replacement Companies in Merrimack
Merrimack Valley Glass & Mirror
Newburyport, MA-
Helps Educate Customers
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Excellent Customer Service
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Free Quotes
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No-Hassle Pricing
Services Offered
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Double-Hung
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Full-Service Installations
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Custom Window Designs
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Stained Glass
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Residential Windows
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Commercial Windows
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Sliding Glass
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Aluminum Window Frames
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Glass Showers
NEWPRO
Woburn, MA-
Educational Website
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No-fee Quotes
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Price Transparency
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Excellent Customer Service
Services Offered
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Glass Showers
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Energy-Efficient Options
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Custom Window Designs
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Double-Hung
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Sliding Glass
Nashua Glass
Nashua, NH-
Free Quotes
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No-Hassle Pricing
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Educational Website
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Locally Recognized for Quality
Services Offered
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Residential Windows
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Architectural Glass
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Tempered Glass
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Doors
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Custom Window Designs
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Commercial Windows
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Double-Hung
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Sliding Glass
The Window Source NH
Seabrook, NH-
Award-Winning
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No-Hassle Pricing
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Reliable Service
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Educational Website
Services Offered
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Architectural Glass
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Fast Delivery
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Energy-Efficient Options
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Custom Windows
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Double-Hung
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Sliding Glass
Window World of Boston
Woburn, MA-
Excellent Customer Service
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Free Quotes
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Consistent Workmanship
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Locally Recognized for Quality
Services Offered
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Sliding Glass
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Custom Window Designs
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Energy-Efficient Options
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Double-Hung
Timberlane Glass and Mirror
Plaistow, NH-
Price Transparency
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No-fee Quotes
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Good Customer Service
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Dependable Service
Services Offered
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Full-Service Installations
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Custom Windows
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Residential Windows
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Sliding Glass
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Commercial Windows
Rite Window
Woburn, MA-
Good Customer Service
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No-Hassle Pricing
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Educational Website
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Consistent Workmanship
Services Offered
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Custom Windows
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Glass Showers
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Energy-Efficient Options
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Double-Hung
Pro Entry Installs LLC
Salem, NH-
Arrives on Time
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Dependable Service
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Excellent Customer Service
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Award-Winning
Services Offered
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Custom Window Designs
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Residential Windows
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Double-Hung
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Bay & Bow Windows
Window World of New Hampshire
Manchester, NH-
Price Transparency
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Dependable Service
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Free Quotes
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Gives to charity
Services Offered
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Custom Window Designs
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Architectural Glass
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Sliding Glass
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Double-Hung
Guaranteed Aluminum & Vinyl Inc
Lowell, MA-
Dependable Service
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Free Quotes
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Price Transparency
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Excellent Customer Service
Services Offered
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Residential Windows
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Custom Window Designs
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Aluminum Window Frames
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Business Windows
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Double-Hung
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Sliding Glass
Demers Plate Glass Co
Haverhill, MA-
No-fee Quotes
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Excellent Customer Service
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Price Transparency
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Educational Website
Services Offered
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Residential Windows
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Architectural Glass
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Doors
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Custom Window Designs
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Aluminum Window Frames
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Commercial Windows
Pella Windows & Doors of Woburn
Woburn, MA-
Locally Recognized for Quality
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Excellent Customer Service
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No-fee Quotes
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Supports Charities
Services Offered
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Custom Window Designs
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Sliding Glass
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Double-Hung
Clear Choice Home Improvements
Manchester, NH-
No-fee Quotes
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Award-Winning
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Good Customer Service
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Timely Service
Services Offered
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Custom Window Designs
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Sliding Glass
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Double-Hung
Advanced Glass & Mirror
Westminster, MA-
Excellent Customer Service
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Educational Website
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Free Quotes
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No-Hassle Pricing
Services Offered
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Residential Windows
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Architectural Glass
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Glass Showers
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Custom Windows
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Business Windows
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Sliding Glass
Central Glass Co
Westminster, MA-
Educational Website
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Free Quotes
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No-Hassle Pricing
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Excellent Customer Service
Services Offered
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Residential Windows
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Architectural Glass
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Glass Showers
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Custom Windows
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Commercial Windows
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Sliding Glass
Wayside Glass & Mirror
Marlborough, MA-
Excellent Customer Service
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No-fee Quotes
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No-Hassle Pricing
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Educational Website
Services Offered
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Residential Windows
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Architectural Glass
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Doors
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Custom Windows
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Aluminum Window Frames
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Commercial Windows
Red Dog's Roofing LLC
Fitchburg, MA-
Educational Website
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Good Customer Service
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Free Quotes
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Award-Winning
Services Offered
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Custom Window Designs
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Residential Windows
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Business Windows
Milford Windows & Siding
Milford, NH-
Good Customer Service
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Consistent Workmanship
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Helps Educate Customers
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Arrives on Time
Services Offered
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Custom Windows
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Residential Windows
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Commercial Windows
US Siding & Roofing
Sudbury, MA-
Educational Website
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Arrives on Time
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Reliable Service
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Good Customer Service
Services Offered
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Custom Window Designs
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Energy-Efficient Options
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Commercial Windows
Queen City Glass & Mirror
Manchester, NH-
Excellent Customer Service
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Dependable Service
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No-Hassle Pricing
Services Offered
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Residential Windows
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Glass Showers
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Custom Window Designs
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Aluminum Window Frames
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Full-Service Installations
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Commercial Windows
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Sliding Glass
Pane Free Glass
Manchester, NH-
No-Hassle Pricing
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Good Customer Service
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Free Quotes
Services Offered
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Residential Windows
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Glass Showers
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Custom Windows
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Full-Service Installations
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Commercial Windows
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Double-Hung
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Sliding Glass
How Installing Energy-Efficient Windows in Merrimack 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 help you:
- Decrease your carbon footprint: Decreasing the amount of energy you use also lowers your indirect greenhouse gas emissions. You could reduce it by about 152 pounds.
- Save money on electricity bills: According to the Department of Energy, heat gained or lost through windows makes up around 25-30% of residential energy use. Installing energy-efficient models can help reduce how much you have to pay, therefore saving you about 12% more on your bills.
- Protect your valuables from fading: When you upgrade to energy-efficient windows with low-emissivity coatings, your floors, carpets and furniture will be protected from fading due to their ability to filter out damaging UV rays.
- Protect your investment: When you have an older home, your windows could also be outdated or damaged. Keeping your windows up to date is an important part of maintaining your property and its real estate value.
Estimated Cost of Window Replacement in Merrimack
Let's take a look at the cost of window replacement and the types of services you may need for your home.
How Much Do New Windows Cost?
According to our market research, the national average cost to install a single window is about $600. However, window installation costs can range from $200 to $1,200 per window. But costs will vary considerably depending on the number of windows you need, your location, the quality of your products and the current condition of your home. Many window companies also offer door installations and other add-ons like baths, coating, shutters and more. These extra services will increase overall project costs.
Keep in mind that energy-efficient windows may cost more upfront, but Energy Star predicts the upgrade will save you between $101 and $583 a year when you replace single-pane windows and between $27 and $197 a year when you replace double-pane, clear glass windows. Your exact savings will vary based on your local climate, energy rates and individual home characteristics.
Getting free quotes from several providers is the best way to figure out which one is right for you.
What Services do Window Installers Offer?
The first step of an installation is to figure out whether you should get a full-frame or pocket installation.
Full-frame installations require replacing the entire window — the sill, frame, trim and all. These are most common when you want a new style for your windows or when it has a great amount of rot or deterioration. Full-frame installations are more comprehensive and will increase overall costs. Pocket installations (or retrofits) entail installing a new window within its existing frame, which makes pocket installations take less time and therefore cost less. However, if the frame has any rot or deterioration, you should opt for a full-frame installation instead.
If you're unsure which type of window installation service you need, your installer should be able to help you out. Generally, the decision is based on factors such as the age and condition of the home, the type of building material, budget and time restrictions.
Best Overall
Renewal by Andersen
- Member of US Green Building Council
- Award-winning company
- Great industry reputation
- More expensive than competition
Best Affordability
Window World
- Lifetime warranty
- Low prices relative to competitors
- EnergyStar Partner
- Quality of service will depend on your area
Best Warranty
Universal Windows Direct
- Manufactures products in-house
- Makes charitable contributions
- Lifetime warranty
- Quality of service will depend on your area
How We Choose the Best Window Installers in Merrimack
In our search to make your home improvements easier and more eco-friendly in Merrimack, EcoWatch evaluated many companies before landing on these. Along with energy efficiency, we evaluated several window installers in Merrimack and assigned rankings based on the following methodology:
Service Area
Because this is a guide for Merrimack, we paid more attention to companies that provide services to the city. There are certainly other reputable providers that didn't make our list because they wouldn't be able to serve homeowners in Merrimack.
Work Quality
When selecting new windows, the quality and range of services can often play just as important of a role in overall efficiency and performance as the brand you get. We do give window installers higher marks if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.
Customer Reviews
Customer feedback is another very important review factor. If the majority of customers don't have nice feedback about their service from a certain window installation company, it won't be featured on EcoWatch.
Cost
Cheaper windows certainly don't mean better windows, but we know many of our readers want to keep costs low when possible. When analyzing providers' prices, we awarded higher scores to companies with reasonable prices and accessible financing rather than "cheaper" services.
Warranty
Protecting your investment in new windows is important to many homeowners. For that reason, window installation companies with lengthy warranties for products, parts and installation (aka workmanship) 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 installers that have more years of experience earn higher rankings by our standards. We like to see at least ten years of experience.
Merrimack, NH Window Replacement FAQs
How much does a window install cost?
The national average cost to replace a single window is around $600 but can range from $200 to $1,200, based on a few different factors. The price is often dependent on the size of the window, the location of your property and the type and material of the window. Also, remember that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What are the types of windows?
The most common kinds of windows for homes are double-hung and single-hung windows, casement windows, awning windows, bay windows, picture windows, slider windows and transom windows.
What services do window replacement companies provide?
Window installation professionals go to your property to remove your old windows and replace them with new ones. Some providers install products manufactured by other companies, whereas others install their own windows. The installer will also clean up after the installation.
When is the best time of year to replace windows?
Replacement windows can be installed during any season, but autumn might be best. No matter when you install them, the contractors will take steps to make sure that too much hot or cold air doesn't get into your home, so the temperature outside doesn't necessarily matter that much. What's most important is that the weather should be dry.
How often do you need to replace your windows?
Windows have a typical lifespan of about 20 to 30 years. If your windows are older than that, they should probably be replaced. Apart from that, if your windows have damage anywhere on them, or they have become difficult to open or close, they may need to be replaced.