20 Best Window Companies in Killingly, CT (2023 Reviews)
If you're looking to upgrade to new windows, our list of the best window installation companies can help.
We analyzed all the top-rated window companies in Killingly 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
A review of the best window installation companies in Killingly may not seem like the most captivating article on the EcoWatch site, but trust us, windows have a more direct impact on your life than you might realize. According to the Department of Energy, heat gained or lost through old or damaged windows could represent 25-30% of residential energy climate control costs.
That's also bad for the environment because the extra energy required by old windows increases your carbon footprint.
So if you're constructing a new home, renovating or changing out old windows in Killingly, you've found the best place to get started.
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 Killingly
The EcoWatch team assessed dozens of window companies in Killingly to find the top ones for our readers. The providers in this article passed our review standards for energy-efficient offerings as well as customer service, local expertise, price and beyond.

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 offers windows expertise in Killingly. This provider has 27 years of experience in the window installation business, and it has established itself as one of the most respected companies in Killingly. Hundreds of positive reviews from customers online back the company's reputation.
You may want to consider opting for Window World if you're looking for a installer 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 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 mention that you want energy-efficient windows to your Window World representative when inquiring about services.
How much does Window World cost in Killingly?Prices aren’t listed on Window World’s website, but it's known for offering some of the most affordable window installations around. Getting a free quote on its website is the best way to get more accurate information.

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 Killingly. This company has 27 years of experience in the windows industry, and it has become one of the most respected companies in Killingly.
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 caters to eco-conscious consumers by providing energy-efficient window offerings. 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 Killingly?Andersen does not detail prices 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 inquire about a free quote on its website for more information about pricing.

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 is 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 around 23 years of experience in the window replacement industry. Its reputation is backed by all the positive reviews on customer review websites.
It has established itself as a company that installs windows and doors at businesses across the Eastern U.S.
Energy Efficiency of Aeroseal Windows WindowsThere are a wide variety of window types available from Aeroseal Windows, some of which are Energy Star products. 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 Killingly?Prices aren’t available on Aeroseal’s website, but it provides high-quality windows at a competitive price point. You can ask for a free quote on its website for more information about the cost.

Window Nation
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Award-winning company
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Manufactures products in-house
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Custom designs
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Wide variety of products and services
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Installation not covered by warranty
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Limited service area
Window Nation offers the best residential windows in Killingly. This provider has 16 years of experience in the window installation business, and it has established itself as one of the most respected companies in Killingly. Hundreds of positive reviews from customers online back the company's reputation.
You may want to consider opting for Window Nation if you're looking for a installer that gives customers the opportunity to view products and to speak to a representative in person in its showrooms.
Energy Efficiency of Window Nation WindowsWindow Nation 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 mention that you want energy-efficient windows to your Window Nation representative when inquiring about services.
How much does Window Nation cost in Killingly?Prices aren’t listed on Window Nation’s 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. Getting a free quote on its website is the best way to get more accurate information.
We strive to remain unbiased and transparent by mentioning pros and cons for every installer. Additionally, any partnerships do not influence our rankings.
More Window Companies in Killingly
Renewal by Andersen of Rhode Island
Smithfield, RI-
Price Transparency
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Educational Website
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Free assessment
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Good Customer Service
Services Offered
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Energy-Efficient Options
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Sliding Glass
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Custom Window Designs
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Double-Hung
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Fast Delivery
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Window Replacement
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Bay Windows
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Full-Service Installations
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Residential Windows
Window World of Rhode Island
Warwick, RI-
Price Transparency
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Good Customer Service
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Free assessment
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Educational Website
Services Offered
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Fast Delivery
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Custom Window Designs
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Bay Windows
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Double-Hung
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Sliding Glass
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Residential Windows
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Window Replacement
Window Nation
Wallingford, CT-
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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Window Replacement
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Custom Window Designs
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Bay Windows
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Double-Hung
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Residential Windows
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Stained Glass
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Energy-Efficient Options
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Sliding Glass
The Window Source RI
Smithfield, RI-
Free assessment
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Price Transparency
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Good Customer Service
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Timely Service
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Educational Website
Services Offered
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Window Replacement
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Residential Windows
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Energy-Efficient Options
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Custom Window Designs
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Sliding Glass
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Double-Hung
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Bay Windows
QSPS Housing Solutions
Johnston, RI-
Price Transparency
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Good Customer Service
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Educational Website
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Free assessment
Services Offered
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Glass Showers
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Double-Hung
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Custom Window Designs
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Residential Windows
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Fast Delivery
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Window Replacement
Krystal Glass & Door Co
Smithfield, RI-
Free assessment
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Timely Service
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Good Customer Service
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Educational Website
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Price Transparency
Services Offered
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Tempered Glass
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Window Replacement
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Residential Windows
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Sliding Glass
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Double-Hung
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Fast Delivery
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Commercial Windows
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Aluminum Window Frames
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Custom Window Designs
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Glass Showers
Rhode Island Remodeling
Cranston, RI-
Price Transparency
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Good Customer Service
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Educational Website
Services Offered
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Energy-Efficient Options
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Custom Window Designs
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Window Replacement
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Fast Delivery
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Residential Windows
Pryde Remodeling
Southbridge, MA-
Good Customer Service
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Educational Website
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Price Transparency
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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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Fast Delivery
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Residential Windows
Home Services at The Home Depot
Coventry, RI-
Educational Website
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Price Transparency
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Free assessment
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Good Customer Service
Services Offered
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Residential Windows
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Energy-Efficient Options
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Glass Showers
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Fast Delivery
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Stained Glass
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Commercial Windows
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Custom Window Designs
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Window Replacement
Esler Companies
Smithfield, RI-
Price Transparency
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Educational Website
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Good Customer Service
Services Offered
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Custom Window Designs
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Window Replacement
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Residential Windows
United Better Homes - Roofing, Solar & Windows
Central Falls, RI-
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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Window Replacement
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Full-Service Installations
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Sliding Glass
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Residential Windows
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Bay Windows
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Commercial Windows
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Fast Delivery
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Custom Window Designs
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Double-Hung
Creative Enclosures
Bozrah, CT-
Good Customer Service
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Free assessment
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Educational Website
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Price Transparency
Services Offered
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Custom Window Designs
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Window Replacement
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Glass Showers
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Residential Windows
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Fast Delivery
Christopher Home Improvement
Norwich, CT-
Timely Service
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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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Fast Delivery
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Custom Window Designs
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Residential Windows
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Window Replacement
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Commercial Windows
Rescom Exteriors, Inc
Auburn, MA-
Free assessment
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Educational Website
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Price Transparency
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Good Customer Service
Services Offered
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Double-Hung
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Bay Windows
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Glass Showers
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Fast Delivery
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Commercial Windows
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Custom Window Designs
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Window Replacement
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Residential Windows
Custom Built Window Manufacturing
Warwick, RI-
Good Customer Service
Services Offered
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Fast Delivery
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Energy-Efficient Options
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Aluminum Window Frames
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Glass Showers
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Custom Window Designs
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Residential Windows
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Sliding Glass
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Window Replacement
United Home Experts of New London County
Norwich, CT-
Price Transparency
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Good Customer Service
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Educational Website
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Free assessment
Services Offered
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Double-Hung
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Window Replacement
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Commercial Windows
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Custom Window Designs
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Residential Windows
Nescor
Cumberland, RI-
Good Customer Service
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Educational Website
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Free assessment
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Price Transparency
Services Offered
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Stained Glass
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Window Replacement
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Fast Delivery
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Custom Window Designs
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Residential Windows
Royal Thermal View Inc
MA, MA-
Educational Website
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Price Transparency
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Good Customer Service
Services Offered
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Custom Window Designs
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Residential Windows
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Window Replacement
Columbia Glass Inc
Columbia, CT-
Price Transparency
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Good Customer Service
Services Offered
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Window Replacement
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Residential Windows
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Tempered Glass
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Sliding Glass
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Custom Window Designs
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Double-Hung
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Commercial Windows
C. Langway and Sons Contractors
Millbury, MA-
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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Residential Windows
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Glass Showers
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Custom Window Designs
Calculate how much you can expect to pay for window installation and replacement in Killingly, CT 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 Killingly Saves You Money
There are quite a few benefits of switching to energy-efficient windows. A few reasons you may want to consider making the change are the following:
- Better temperature control in your home: Energy-efficient windows can cut back on how hard your heating system needs to work to heat your home.
- Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent the fading of your floors, carpets and furniture by filtering out UV rays.
- Protect your investment: When you have an older home, your windows could also be outdated or leaky. Upgrading your windows is an important part of maintaining your property and its real estate value.
- Save money on electricity bills: Installing energy-efficient windows reduces your energy bills by about 12% since you use less energy.
Estimated Cost of Window Replacement in Killingly
Windows come in different purposes, shapes and styles, so costs and services will differ remarkably depending on your project. Below, we describe the typical cost and services that you'll find from window installation companies.
How Much Do New Windows Cost?
Even though the national average of replacing a single window is around $600, it can range anywhere from $200 to $1,200. These figures vary based on the specifics of your installation, including the location of your home, material, size, type, number of windows and more.
Keep in mind that energy-efficient windows may cost more, but Energy Star predicts the upgrade will save you between $101 and $583 per year when replacing single-pane windows and between $27 and $197 per year when replacing double-pane, clear glass windows. Your savings will vary depending on your local climate, energy rates and individual home characteristics.
The cost of your window installation will also vary depending on the type of material you choose for the frames. Wood windows are typically the most expensive, although it depends if they are solid wood or clad with aluminum or vinyl. Fiberglass windows also tend to be a bit more expensive than vinyl, but they are more efficient.
What Services do Window Installers Offer?
The first thing to ask yourself when planning to replace your windows is: Do you want a full-frame installation or a pocket installation?
Full-frame installations are necessary when you want a new style or your window has a lot of rot or deterioration. With this service, your installers will replace the complete window, including the frame, sill and trim. A pocket installation means replacing a window within the existing frame, which tends to be less expensive than a full-frame installation.
Your window installation company can help you figure out which type of installation you need.
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 Killingly
In our hunt to make your home improvements easier and more eco-friendly in Killingly, the EcoWatch Reviews team examined many companies before landing on these. Along with energy efficiency, we analyzed several window installers in Killingly and assigned rankings using the following methodology:
Service Area
This one is self-explanatory, but we've chosen to highlight window installation companies that serve a wide variety of states and cities so you can find a quality window installation company near you.
Work Quality
When installing new windows, the quality and variety of services can often play just as important of a role in overall efficiency and performance as the type of window you get. We do give window installers higher marks if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.
Customer Reviews
We analyzed trends in recent customer feedback to determine the companies with the highest rates of customer satisfaction. Customer satisfaction might be the factor we place the most value on, as it reflects the quality of services across most other categories, including warranty, quality of parts, professionalism, quality of installation, cost and more.
Cost
Cheaper windows don't necessarily mean better windows, but we know many of our readers would like to keep costs as low as possible. When analyzing the prices of providers, we awarded higher points 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 that give you lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Because of Killingly's climate, homeowners need to be wary of rot, low efficiency and water damage. We factored in local experience to reflect the ability of Killingly window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.
Killingly, CT 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, based on a variety of factors. The price is usually influenced by the type and material of the window, the location of your property and the size of the window. Also, remember that energy-efficient windows may cost more initially but can save you a decent amount of money a year in energy bills.
What are the different types of windows?
There are various kinds of windows you can get for your home, including casement windows, bay windows, awning windows, double-hung and single-hung windows, picture windows, transom windows and slider windows.
What do window installers do?
Window installers cover the entire process — from replacing your old windows with new ones to cleaning up after the installation. In addition, many companies offer window manufacturing, customization and repairs.
How long does it typically take to install windows?
Since the average installation time of a window is 30 minutes, around 16 windows can be installed during an 8-hour work day.