20 Best Window Companies in Merrimack, NH (2025 Reviews)
Are you thinking about upgrading your windows? Our list of the top window installation companies can help you choose the right one for you.
We analyzed all the top-rated window companies in Merrimack and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
Although eco-friendly energy sources like wind and solar are important when it comes to reducing your carbon footprint, improving your house’s efficiency can also have a big impact on home energy conservation. If your house has old or damaged windows, your HVAC system could be working extra hard to heat or cool your house. This means higher electricity bills.
That’s not great for your bank account or the environment, but one of the top window installation companies can help with that.
As windows have such a big impact on your home, choosing the right company for you is a big decision to make. That’s why the EcoWatch team has made this list of the top window installation companies, so you can more easily make an informed decision.
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
Best Window Installation & Replacement Companies in Merrimack
The EcoWatch team examined dozens of companies that serve the Merrimack area to find the top window installation companies that fit our standards. The companies mentioned in this article scored the best in our review categories, such as energy-efficient offerings, availability, local expertise, customer service, price and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World offers windows expertise in Merrimack. This company has 27 years of experience in the window installation business, and it has become one of the best companies in Merrimack.
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 WindowsIts high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World’s offerings are Energy Star certified, so be sure to mention that you’d like Energy Star windows when inquiring.
How much does Window World cost in Merrimack?Prices are not available on Window World’s website since the cost of window replacement depends 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. The best way to get more accurate information is to receive a free quote from the company.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen offers the best availability in Merrimack. This company has 27 years of experience in the window installation business, and it has become one of the best companies in Merrimack.
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 WindowsA handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019. Not all of Andersen’s offerings are Energy Star certified, so be sure to mention that you’d like Energy Star windows when inquiring.
How much does Renewal by Andersen cost in Merrimack?Prices are not available on Andersen’s website since the cost of window replacement depends 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. The best way to get more accurate information is to receive a free quote from the company.

Aeroseal Windows
Many years of experience
Great industry reputation
Low number of customer complaints
Manufactures products in-house
Custom Designs
No lifetime warranty
Not ideal for residential installations
Aeroseal Windows offers the best window installation for businesses in Merrimack. This company has 23 years of experience in the window installation business, and it has become one of the best companies in Merrimack.
It installs windows and doors at businesses across the Eastern U.S.
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 be sure to mention that you’d like Energy Star windows when inquiring.
How much does Aeroseal Windows cost in Merrimack?Prices are not available on Aeroseal’s website since the cost of window replacement depends on how many and what type(s) of windows you need. However, it provides high-quality windows at a competitive price point. The best way to get more accurate information is to receive a free quote from the company.
We try to remain unbiased and transparent by describing pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Merrimack
Renewal by Andersen of Boston
Northborough, MAEducational Website
Good Customer Service
Price Transparency
Free assessment
Services Offered
Window Replacement/Installation
Bay Windows
Double-Hung
Skylights
Glass Doors
Power Home Remodeling
Marlborough, MAGood Customer Service
Services Offered
Window Replacement/Installation
Energy-Efficient Options
DaBella
Salem, NHTimely Service
Good Customer Service
Services Offered
Vinyl Frames
Glass Doors
Window Replacement/Installation
Double-Hung
Window Nation
Norwood, MAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Double-Hung
Energy-Efficient Options
Custom Window Designs
Glass Doors
Vinyl Frames
Bay Windows
Affordable Vinyl Windows & Siding Inc
Auburn, NHGood Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Vinyl Frames
Pro Entry Installs LLC
Salem, NHTimely Service
Price Transparency
Good Customer Service
Educational Website
Services Offered
Bay Windows
Window Replacement/Installation
Glass Doors
Double-Hung
Manny's Roofing
Pelham, NHFree assessment
Price Transparency
Timely Service
Educational Website
Good Customer Service
Services Offered
Window Replacement/Installation
Roof Windows
Skylights
Geno the Handyman
Stoneham, MATimely Service
Free assessment
Services Offered
Energy-Efficient Options
Window Repair
Window Replacement/Installation
First Choice Construction, LLC
Beverly, MAPrice Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Rogers Insulation Specialists
Framingham, MAPrice Transparency
Timely Service
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Triple Pane Glass
H & J Homes Solutions LLC
Shrewsbury, MAEducational Website
Free assessment
Price Transparency
Good Customer Service
Services Offered
Window Replacement/Installation
Great Bay Roofing & Exteriors
Rochester, NHPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Bay Windows
Skylights
Window Replacement/Installation
Mighty Dog Roofing Metro West Boston
Needham, MAGood Customer Service
Free assessment
Timely Service
Price Transparency
Services Offered
Skylights
Window Replacement/Installation
Window Repair
Closet & Storage Systems
Auburn, MAGood Customer Service
Educational Website
Price Transparency
Free assessment
Services Offered
Glass Showers
Window Replacement/Installation
Mirrors
Lighthouse Contracting Group, LLC
Gilford, NHEducational Website
Free assessment
Price Transparency
Good Customer Service
Services Offered
Window Replacement/Installation
Dependable J M R Siding
Manchester, NHFree assessment
Services Offered
Energy-Efficient Options
Vinyl Frames
Window Replacement/Installation
Dracut Window & Door
Dracut, MAPrice Transparency
Educational Website
Free assessment
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Country Glass
Hudson, MAPrice Transparency
Free assessment
Services Offered
Mirrors
Glass Showers
Custom Glass
Window Replacement/Installation
Energy-Efficient Options
Glass Routes Co
Madbury, NHPrice Transparency
Free assessment
Good Customer Service
Educational Website
Services Offered
Glass Showers
Window Replacement/Installation
Mirrors
Vinyl Frames
Custom Glass
Cechinel Siding & Windows
Somerville, MAEducational Website
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Bay Windows
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
Energy-efficient windows can benefit you in more than one way. Here are some reasons you may want to take the plunge and make the switch:
- Save on power bills: Since energy-efficient windows decrease the amount of energy needed to heat or cool your home, the switch can help you save about $463 annually on your energy bills in Merrimack.
- Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
- Reduce your carbon footprint: You can reduce your indirect greenhouse gas emissions by about 12% once you install Energy Star certified windows. In Merrimack, that’s about 152 pounds per year on average.
- Protect your investment: The older your home is, the more likely you are to benefit from switching to energy-efficient windows. Older homes usually have windows that are outdated, drafty or maybe even damaged in some way. Updating your windows could help raise the value of your property if you decide to sell.
Estimated Cost of Window Replacement in Merrimack
Let’s go over the cost of window replacement and the kinds of services you may need for your home.
How Much Do New Windows Cost?
On average, homeowners in Merrimack can anticipate that most window installations will range from $250 to $1,200, with the average cost sitting at around $600. These numbers are based on specific characteristics of your installation, including the location of your home, type, size, material, number of windows and more.
Whether or not you choose energy-efficient windows is another factor that will influence the cost. These will almost always cost more than other windows, but on the other hand, you can save about $463 a year on your energy bills in Merrimack.
Asking for free quotes from several companies is the best way to figure out which one will work best for your budget.
What Services do Window Installers Offer?
Generally, there are two types of window replacement services companies offer: full-frame and pocket installations.
A full-frame installation is a replacement of the total window. It involves removing the old window, the sill, and the exterior and interior trim. It also involves additional materials, like insulation and drip edges, which raise the overall cost of the project. It’s also worth noting that it’s not uncommon for homeowners to have to touch up the paint surrounding the window after a full-frame installation. Pocket installations (or retrofits) entail replacing a window within the existing frame, which makes pocket installations take less time and therefore cost less. However, if the frame has any damage or rot, you will most likely need a full-frame installation instead.
If you’re not sure which type of window installation service you need, your installer can advise you. Typically, the decision is influenced by factors such as the age and condition of the home, the type of building material, budget and time restrictions.
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
How We Choose the Best Window Installers in Merrimack
In our search to make your home improvements easier and more eco-friendly in Merrimack, the EcoWatch Reviews team evaluated many companies before deciding on these. We’ve reviewed the top window installation companies in Merrimack mostly based on their energy efficient offerings, as it’s what’s best for the environment and for you as a homeowner. Energy-efficient windows have been shown to lower energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
Because this is a guide for Merrimack, we only included companies that cover 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 ensure its contractors are well-qualified and that the company has received plenty of positive customer feedback to vouch for its service.
Customer Reviews
Another self-explanatory yet super important review factor is customer feedback. If the majority of customers don’t have good things to say about their experience with a certain installer, it won’t be featured on EcoWatch.
Cost
Cheaper windows certainly don’t mean better windows, but we know many of our readers would like to keep costs low when possible. When analyzing the prices of providers, 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. For that reason, window installation companies that have lengthy warranties for products, parts and labor rank higher with EcoWatch.
Years of Experience
Due to Merrimack’s climate, homeowners need to be wary of rot, water damage and low efficiency. We factored in local experience to reflect the ability of Merrimack window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.
Merrimack, NH Window Replacement FAQs
What is the average cost to install new windows?
The national average cost to install a single window is around $600 but can range from $200 to $1,200, based on a few different factors. The price is usually influenced by the location of your property, the size of the window and the type and material of the window. Also, bear in mind that energy-efficient windows may cost more initially but can save you hundreds of dollars a year in energy bills.
Which type of window should I get?
Generally, double-pane windows will be more efficient than single-pane windows and windows that do not open are more efficient than windows that do. To be sure you’ll get the most energy-efficient windows, look for models that have the blue Energy Star certification attached to them — that means they’re certified energy-efficient 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 experience with home improvement projects. Using a window replacement 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 all my windows at once?
If your windows are more than 20 years old, you probably need to replace all of them. At that point, they are typically less efficient, draftier and/or more damaged than new windows. Replacing your windows all at once will involve less paperwork and less stress.
How long does it take to install windows?
Each window takes around 30 minutes to install based on the type of window. However, the window installation can take two days or more if you have a lot of windows that must be installed.