20 Best Window Companies in Nashua, NH (2025 Reviews)

How Installing Energy-Efficient Windows in Nashua Saves You Money

There are quite a few benefits of upgrading to energy-efficient windows. Some reasons you may want to consider making the change are the following:

• Save on power bills: According to the Department of Energy, heat gained or lost through windows accounts for about 25-30% of residential energy use. Replacing your windows with energy-efficient models can help reduce how much you have to pay, therefore saving you about 12% more on your bills.
• Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its real estate value, especially if you have an older home.
• Protect your valuables: The low-emissivity coatings on many Energy Star certified windows help prevent the fading of your floors, carpets and furniture by filtering out UV rays.
• Decrease your carbon footprint: Decreasing the amount of energy you use also lowers your carbon emissions. You could reduce it by 152 pounds per year on average.

Estimated Cost of Window Replacement in Nashua

Windows come in varying shapes, styles and purposes, so costs and services will vary remarkably based on several factors. Below, we describe the typical cost and services that you can get from window installers.

How Much Do New Windows Cost?

The average cost to replace one window is about $600 but can range anywhere from $200 to $1,200. How much it will cost varies based on several factors, including material, size, number of windows, the location of your home, type and more.

With windows, efficiency is the most important factor for most homeowners. Windows with higher efficiency may cost more off the bat, but by increasing the efficiency of your home — especially during the winter — they can provide decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Nashua homeowners $463+ per year after replacing single-pane windows.

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

What Services do Window Installers Offer?

There are generally two types of window replacement services: full-frame and pocket installations.

A full-frame installation replaces the full window, including the windowsill, frame, trim and the window panes. As this kind of installation requires more time, it will cost more than a pocket installation. A pocket installation involves replacing a window within the existing frame, which tends to be less expensive than a full-frame installation.

If you’re hiring a reputable window installation company, your company can advise you on the best type for your project. In Nashua, the choice will mostly depend on the efficiency of your home and the age of your existing frames.

How We Choose the Best Window Installers in Nashua

EcoWatch reviews are different from most reviews, as we examine these companies through a sustainability lens. Along with energy efficiency, we analyzed window companies all across the state and assigned rankings based on the following methodology:

Service Area

Since this is a guide for Nashua, we gave more points to companies that provide services to the city. There are other reputable providers that didn’t make the cut because of the low odds that they would serve the average homeowner in Nashua.

Work Quality

When choosing new windows, the quality and variety of services can often play just as important of a role in insulation and performance as the brand of window you get. We do rate window installers higher if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.

Customer Reviews

We analyzed patterns in recent customer feedback to determine the companies with the highest rates of customer satisfaction, weighted by sample size. Customer satisfaction may be the most important factor, as it reflects the quality of services across nearly every category, including quality of installation, cost, warranty, professionalism, quality of parts and more.

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 providers’ prices, we gave higher scores to companies with reasonable prices and accessible financing rather than “cheaper” services.

Warranty

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

Years of Experience

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