20 Best Window Companies in Merrimack, NH (2023 Reviews)
Are you thinking of upgrading your windows? Our list of the top window installation companies can help you narrow down which one to pick.
We analyzed all the top-rated window companies in Merrimack and selected the best 20 based on:
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Customer reviews
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Window installation expertise
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Popularity with home-owners like you
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Updated September 15, 2023
Why you can trust EcoWatch
The EcoWatch team is all about helping Merrimack homeowners make their homes more eco-friendly. Drafty windows can reduce your home's energy efficiency by up to 30%, according to the Department of Energy. In Merrimack, that's about $463 per year that you could save on your electric bills by making the switch.
Installing energy-efficient windows on your house can help you save money each month on your electricity bills — and you can help the environment, too.
Unlike other review sites, EcoWatch ranks window companies based on energy efficiency while also factoring in cost, customer satisfaction and service area.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Window Veteran
Window World
- EnergyStar Partner
- Wide variety of products and services
- Lifetime Warranty
Best Window Installation & Replacement Companies in Merrimack
The EcoWatch Reviews team evaluated dozens of providers that service the Merrimack area to find the top window installation companies by our standards. The providers in this article scored best in our review categories, such as energy-efficient offerings, price, local expertise, availability, customer service and more.

Window World
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EnergyStar Partner
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Large serice area
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Low prices relative to competitors
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Great industry reputation
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Lifetime warranty
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Quality of service will depend on your area
Window World provides windows expertise in Merrimack. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window installation business for around 27 years. Its reputation is backed by hundreds of positive reviews on customer review websites.
It 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 carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want Energy Star windows when inquiring. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.
How much does Window World cost in Merrimack?Pricing information is not available on Window World’s website since the cost of window installment 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. You can inquire about a free quote on its website for more information about the cost.

Renewal by Andersen
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Great industry reputation
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Award-winning company
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Member of US Green Building Council
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Manufactures products in-house
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No lifetime warranty
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More expensive than competition
Renewal by Andersen provides the best availability in Merrimack. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window installation business for around 27 years. Its reputation is backed by hundreds of positive reviews on customer review websites.
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 WindowsRenewal by Andersen carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want 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 Merrimack?Pricing information is not available on Andersen’s website since the cost of window installment differs based on how many and what type(s) of windows you need. However, 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 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 provides the best window installation for businesses in Merrimack. Aeroseal has about 23 years of industry experience, and it currently serves 13 states and Washington D.C. Its reputation is backed by all the positive reviews from customers online.
It has established itself as a company that installs windows and doors at businesses across the Eastern U.S.
Energy Efficiency of Aeroseal Windows WindowsAeroseal Windows is an Energy Star partner offering a variety of energy-efficient windows. Note that not all of the company’s windows are Energy Star certified, so be sure to mention that you want energy-efficient windows to your Aeroseal representative when inquiring about services.
How much does Aeroseal Windows cost in Merrimack?Prices are not available on Aeroseal’s website, as the cost of window replacement varies greatly based on how many and what type(s) of windows you need. However, it provides high-quality windows at a competitive price point. You can inquire about a free quote on its website for more information about pricing.

Universal Windows Direct
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Makes charitable contributions
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Manufactures products in-house
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Wide variety of products and services
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Lifetime warranty
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Limited service area
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Some installations carried out by third-party contractors
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Quality of service will depend on your area
Universal Windows Direct provides 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 been in the window industry for around 20 years.
If you’re looking for a company that has an industry-leading warranty covering products, parts and workmanship for life, Universal may be the provider for you.
Energy Efficiency of Universal Windows Direct WindowsUniversal Windows Direct’s commitment to sustainability shows in its energy-efficient window offerings. 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?Even 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. Receiving a free quote on its website is the best way to know for sure.
Please note that the companies in this section are national, which means the quality of the service may depend on your local team. We have tried to remain unbiased and transparent by describing both pros and cons for every company.
More Window Companies in Merrimack
Renewal by Andersen of Boston
Northborough, MA-
Educational Website
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Good Customer Service
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Price Transparency
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Free assessment
Services Offered
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Glass Showers
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Custom Window Designs
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Residential Windows
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Window Replacement
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Fast Delivery
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Sliding Glass
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Double-Hung
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Bay Windows
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Commercial Windows
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Stained Glass
Window World of New Hampshire
Manchester, NH-
Free assessment
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Timely Service
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Price Transparency
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Educational Website
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Good Customer Service
Services Offered
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Residential Windows
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Bay Windows
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Custom Window Designs
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Double-Hung
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Window Replacement
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Sliding Glass
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Fast Delivery
Dependable J M R Siding
Manchester, NH-
Free assessment
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Price Transparency
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Good Customer Service
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Educational Website
Services Offered
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Window Replacement
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Commercial Windows
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Residential Windows
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Double-Hung
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Sliding Glass
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Fast Delivery
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Custom Window Designs
Pella Windows & Doors of Bedford
Bedford, NH-
Price Transparency
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Free assessment
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Educational Website
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Good Customer Service
Services Offered
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Residential Windows
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Bay Windows
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Double-Hung
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Window Replacement
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Sliding Glass
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Custom Window Designs
Nashua Glass
Nashua, NH-
Good Customer Service
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Price Transparency
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Free assessment
Services Offered
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Fast Delivery
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Residential Windows
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Window Replacement
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Tempered Glass
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Commercial Windows
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Double-Hung
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Glass Showers
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Custom Window Designs
Fiori Construction LLC
Londonderry, NH-
Price Transparency
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Free assessment
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Good Customer Service
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Educational Website
Services Offered
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Custom Window Designs
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Window Replacement
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Residential Windows
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Commercial Windows
Granite State Glass
Hudson, NH-
Good Customer Service
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Price Transparency
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Educational Website
Services Offered
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Custom Window Designs
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Aluminum Window Frames
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Residential Windows
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Glass Showers
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Fast Delivery
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Window Replacement
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Commercial Windows
A Plus Energy Services
Milford, NH-
Price Transparency
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Free assessment
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Educational Website
Services Offered
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Commercial Windows
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Residential Windows
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Window Replacement
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Custom Window Designs
Clear Choice Home Improvements
Manchester, NH-
Good Customer Service
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Free assessment
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Timely Service
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Price Transparency
Services Offered
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Bay Windows
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Custom Window Designs
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Residential Windows
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Window Replacement
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Fast Delivery
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Glass Showers
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Commercial Windows
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Sliding Glass
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Double-Hung
Universal Windows Direct of Manchester
Manchester, NH-
Educational Website
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Good Customer Service
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Free assessment
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Price Transparency
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Timely Service
Services Offered
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Commercial Windows
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Bay Windows
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Window Replacement
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Custom Window Designs
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Sliding Glass
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Full-Service Installations
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Double-Hung
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Residential Windows
PIC Home Pros
Londonderry, NH-
Free assessment
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Educational Website
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Good Customer Service
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Price Transparency
Services Offered
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Fast Delivery
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Glass Showers
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Custom Window Designs
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Window Replacement
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Residential Windows
Rejean's Custom Quality Siding LLC
Manchester, NH-
Good Customer Service
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Price Transparency
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Free assessment
Services Offered
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Custom Window Designs
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Commercial Windows
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Residential Windows
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Window Replacement
S R Windows & Doors Plus Inc
Amherst, NH-
Price Transparency
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Good Customer Service
Services Offered
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Commercial Windows
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Sliding Glass
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Window Replacement
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Residential Windows
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Custom Window Designs
Queen City Glass & Mirror
Manchester, NH-
Price Transparency
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Good Customer Service
Services Offered
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Full-Service Installations
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Commercial Windows
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Glass Showers
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Window Replacement
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Aluminum Window Frames
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Residential Windows
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Sliding Glass
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Custom Window Designs
Morgan Exteriors
Hooksett, NH-
Educational Website
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Free assessment
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Good Customer Service
Services Offered
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Double-Hung
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Window Replacement
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Sliding Glass
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Custom Window Designs
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Residential Windows
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Bay Windows
C. Gosselin Siding & Windows
Manchester, NH-
Price Transparency
Services Offered
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Residential Windows
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Window Replacement
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Fast Delivery
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Window Repair
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Custom Window Designs
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Sliding Glass
Manny's Roofing
Pelham, NH-
Educational Website
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Timely Service
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Price Transparency
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Good Customer Service
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Free assessment
Services Offered
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Window Replacement
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Custom Window Designs
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Residential Windows
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Commercial Windows
DaBella
Salem, NH-
Educational Website
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Price Transparency
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Good Customer Service
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Free assessment
Services Offered
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Glass Showers
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Window Replacement
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Double-Hung
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Bay Windows
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Commercial Windows
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Residential Windows
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Custom Window Designs
Quantum Remodeling LLC
New Boston, NH-
Good Customer Service
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Price Transparency
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Free assessment
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Educational Website
Services Offered
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Glass Showers
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Full-Service Installations
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Aluminum Window Frames
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Residential Windows
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Fast Delivery
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Window Replacement
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Custom Window Designs
Dracut Window & Door
Dracut, MA-
Educational Website
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Free assessment
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Price Transparency
Services Offered
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Residential Windows
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Custom Window Designs
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Energy-Efficient Options
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Window Replacement
Calculate how much you can expect to pay for window installation and replacement in Merrimack, NH using our customized window cost calculator.
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 Merrimack Saves You Money
There are quite a few perks of upgrading to energy-efficient windows. Some reasons you may want to consider making the change are the following:
- Better temperature control in your home: When you live in a city like Merrimack where the winters can be cold, you usually need to rely on your heater to keep your home warm. Energy-efficient windows can cut back on the amount of heat lost through your windows when heating your home.
- Protect your investment: If you have an older home, your windows are most likely in need of replacement. Updating your windows can make your home more comfortable and also help increase the value of your property if you decide to sell.
- Save money on electricity bills: Because energy-efficient windows reduce the amount of energy used to heat or cool your home, the switch can help you save around $463 annually on your energy bills in Merrimack.
- Protect your valuables from fading: When you switch to energy-efficient windows that have low-emissivity coatings, your floors, carpets and furniture will fade less because of their ability to filter out harmful UV rays.
Estimated Cost of Window Replacement in Merrimack
Windows come in different styles, purposes and shapes, so costs and services will differ greatly depending on your project. Below, we detail the typical cost and services that you'll find from window replacement companies.
How Much Do New Windows Cost?
On average, Merrimack homeowners can expect their window replacements to range from $250 to $1,200. The average cost sits at around $600. But prices differ considerably based on the size of your home, complexity of the installation, your location and the quality of the company you choose. Many window installers also provide door installations, which will make your project cost more.
With windows, efficiency is the most important factor for many homeowners. Efficient windows may cost more off the bat, but by increasing the efficiency of your home — especially during the winter — they can give you many years of energy savings. According to Energy Star, buying certified energy-efficient windows can save Merrimack homeowners $463+ a year after replacing single-pane windows.
We recommend requesting free quotes from several window installation companies to find the right windows and the company that works best for your budget.
What Services do Window Installers Offer?
When it comes to window installations, in general there are two types that your installer will offer: full-frame and pocket installations.
Full-frame installations are usually recommended when you want a new style or your window has a lot of deterioration. With this service, your professionals will replace the complete window, including the trim, sill and frame. A pocket installation involves installing a new window within the old frame. So, instead of tearing out the whole window and reinstalling it, the window installer will just slide the replacement window (also called a retrofit or insert window) into the frame.
If you're still debating which kind of installation you need, you can talk to your provider and get their recommendation. The choice mostly depends on how old the frames are and if there's any damage.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Window Veteran
Window World
- EnergyStar Partner
- Wide variety of products and services
- Lifetime Warranty
How We Choose the Best Window Installers in Merrimack
The EcoWatch Reviews team is different from most reviewers since we examine these companies through a sustainability lens. We have reviewed the top window replacement companies in Merrimack mostly based on energy efficiency, as it's the most sustainable option and the best one for homeowners. Energy-efficient 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 Merrimack, we only included companies that serve the city. There are certainly other reputable providers that didn't make the list because of the low odds that they would serve the average homeowner in Merrimack.
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 featured in our guide to make sure its technicians are well-qualified and that the company has gotten plenty of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed trends in recent online reviews to determine the companies with the highest rates of customer satisfaction. Customer satisfaction may be the factor we place the most value on, as it indicates the quality of services across most other categories, including professionalism, cost, quality of parts, warranty, quality of installation and more.
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 awarded higher points to companies with reasonable prices and accessible financing rather than "cheaper" services.
Warranty
As discussed, windows are a considerable investment, so you'll want to make sure that investment is well protected. Window installation companies that have lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Because of Merrimack's climate, homeowners will want to mitigate rot, low efficiency and water damage. We factored in local experience to reflect the ability of Merrimack window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.
Merrimack, NH Window Replacement FAQs
How much should window installation cost?
The typical cost to install a window can range from $450 to $650. There are a variety of factors that affect how much it costs, including your property's location, the materials used in designing the windows, the number of windows, how energy-efficient the windows are, styles and sizes of windows and local labor costs.
What are the most common kinds of replacement windows?
The most common kinds of windows for homes include: casement windows, awning windows, transom windows, double-hung and single-hung windows, picture windows, bay windows and slider windows.
When do I have to use a window installation company?
You should hire a window installation company whenever you want new windows. Installing windows is a complex process that can take a lot of time, so it's best handled by the professionals.
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 ensure 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.