Infinity Windows Review

By Tamara Jude Updated February 1, 2024

Typically service cost ranges from $330 to $800

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Infinity Windows manufactures high-quality, fiberglass windows to improve energy efficiency and elevate home decor. These replacement windows are more durable than vinyl, combined with the timeless appeal of wood. It’s a subsidiary of Marvin Windows and Doors, a leading window brand with more than 100 years of experience.

In this review, we’ll explore Infinity Windows’ product line, installation process, and customers’ experiences.

Fast Facts About Infinity

Infinity Windows Reviews

Infinity Windows has a network of local authorized dealers and installers throughout the country. We reviewed various testimonials from different areas to gauge product and customer service consistency across locations. We analyzed 100 reviews from Yelp and Google Reviews for Infinity dealers in Ohio, Missouri, California, and Pennsylvania, focusing on product quality and installation experiences. 

Overall, homeowners were pleased with their Infinity windows, complimenting their quality and functionality. Several customers commended the simple quote process and thorough salespeople and technicians.

On the negative side, homeowners complained about poor customer service when dealing with local installers. Some customers faced issues contacting dealers for repairs, mainly regarding unreturned phone calls. Other homeowners expressed displeasure with the warranty process and found it challenging to get their products serviced efficiently. 

What Homeowners Say About Infinity

Here’s a sample of reviews for Infinity Window dealers across the country:

“Infinity from Marvin in Cleveland replaced 16 windows and two sliding doors. We couldn’t be happier with the improvement these windows made in our home—and our utility bills! The house is quieter now, and the air conditioner doesn’t run nearly as much, even though the outside temps have been in the mid 90s all week. Love the Low E3!  The crew was very efficient and polite, and they left the areas as clean as before they arrived. We can’t thank them enough!” —Parker R. via Google Reviews

“We love our new windows. The entire experience and process was seamless, from start to finish, beginning with our salesman, Shawn. Very professional, informative and no pressure at all. Then on to Jeff: He came out to measure windows and was v courteous and friendly. Last but not least, our installers Kenny and Bob were extremely professional and efficient. We barely knew they were in our home. They were on time and hard working. Would recommend the entire Infinity team! Thank you!” —Lynn L. via Google Reviews

“We had them install eight windows, and six months later they are now completed and functional. Contacted multiple people through the revolving door of management, and no one would call me back to fix the issue. Windows are junk, and the customer service is worse.” —Jeremy S. via Yelp

“This is the worst company I’ve ever dealt with—from the salesman who totally messed up the order to the installer who did an awful job. It took eight months to get some of the issues corrected. I had made call after call trying to get things right. The door is beautiful, but I would not ever recommend this company for anything. I would not want someone else to go through the nightmare I have.” —Rhonda D. via Yelp

Benefits and Drawbacks of Infinity

Consider these positives and negatives of Infinity Windows before using the company.

Upsides Downsides

In-person, showroom, and virtual consultation options

Only serves 34 states

Signature Ultrex fiberglass is more durable than vinyl

Fiberglass windows only

Windows custom-made to each home to ensure a perfect fit

No pricing information online

Infinity Window Types Available

Infinity from Marvin offers the following fiberglass window styles for homes.

Infinity also offers in-swing French doors, sliding French doors, sliding patio doors, and bi-fold doors.

Infinity Windows Energy Efficiency

According to the U.S. Department of Energy, up to 30% of a home’s heat loss occurs through its windows. Infinity Windows offers several energy-efficient glass options to preserve internal temperatures and reduce your energy costs. Customers can choose from a selection of low-emissivity (Low-E) coated glass, which helps block UV rays and better insulates your home.

Windows are also measured by their U-Factor, indicating how well they retain heat. Windows with a high U-Factor allow more heat to escape. Lower-numbered windows have better heat retention. 

Infinity Windows offers four Low-E insulating coatings tailored to different regional areas. Here’s an overview of each option:

Infinity Window Installation

Infinity Windows offers three types of consultations to accommodate various schedules: showroom, in-home, or virtual. We’ll look at each option and review what you can expect on installation day. 


Homeowners interested in Infinity can visit a local showroom to view the products up close. You begin by scheduling an appointment through the website or by calling the company’s toll-free number. You’ll be connected with the closest project consultant in your area.

The showroom has physical samples of Infinity’s window products to help you determine which options may work best for your home. The project consultant will review your plans and suggest customizations and installations. Next, you’ll review the estimated quote and have the opportunity to ask any questions about the process.  

In-Person Consultation

Similar to the showroom process, an Infinity sales rep will visit your home after you schedule an appointment. The representative will assess your current windows and doors’ condition and suggest the best window types for your home. They’ll also assess moisture or structure issues and recommend repairs if needed.

The rep will go over your energy efficiency options, check your current efficiency, and make suggestions for improvement. A technician will measure your windows twice to ensure the proper measurements are given to the factory for manufacturing. You’ll receive an estimate quote for your installation with full pricing details for your windows.

Virtual Consultation

You’ll need a laptop, computer, or cellphone with a mic and camera for your virtual consultation. To prepare for your appointment, you’ll need to measure any windows or doors you plan to replace. Your virtual salesperson will send full instructions on preparing for your meeting and suggestions for proper measuring. During your meeting, you’ll review your planned project and receive a quote. 


Installation can be completed within one day or over several days, depending on the size of your project. On installation day, local Infinity installers will visit your home with your custom windows. They’ll remove your old windows and install your new Infinity Windows. Once completed, the team will review each window for proper installation and ensure there are no leaks or improper seals. Finally, the team will clean up and dispose of your old windows.

Infinity Pricing and Costs

Infinity from Marvin Windows’ prices aren’t listed on its website. Its fiberglass replacement windows are custom-made for each home, so general window cost information is limited. Based on multiple window suppliers’ sites, Infinity Windows cost an average of $330 to $800 per window. Your final window replacement cost will depend on the number of windows installed, customizations, and efficiency upgrades. 

Although Infinity Windows is a division of Marvin Windows, its product line differs from the main company. Marvin offers aluminum, fiberglass, and wood windows, while Infinity focuses on high-quality fiberglass replacement windows.

Both Infinity and Marvin fiberglass windows use the company’s signature Ultrex material. This high-grade composite was created by Marvin Windows 20 years ago as one of the first of its kind in the windows industry. The company states that Ultrex is eight times stronger than vinyl windows and three times stronger than Fibrex, a composite material exclusive to Andersen Windows. Ultrex fiberglass doesn’t blend or flex, helping to maintain a tight seal in installations. 

Homeowners can customize their windows by choosing Infinity’s standard fiberglass or adding its specialized EverWood option. This veneer has a wood-like appearance, offering a classic style. The company also offers four interior and seven exterior color choices, plus options for specialized glass, hardware, grille patterns, lites, and screens.


Our Recommendation

Infinity Windows from Marvin offers high-quality fiberglass replacement windows. Its signature Ultrex fiberglass is more durable than other composite and vinyl options but doesn’t have a hefty price tag. Although Infinity is a relatively new company, it’s backed by Marvin’s strong brand reputation and 100+ years of experience.

We recommend comparing at least three window replacement brands to find the best offers, features, and styles.

Infinity Windows FAQ

What are the differences between Marvin Integrity and Infinity Windows?

Marvin Integrity windows are typically used for new construction projects and include a real wood interior option. Infinity Windows are mainly used for replacement window projects and offer a wood grain veneer for the interior. Both lines use Marvin’s signature Ultrex fiberglass material and offer customization options. 

Where are Infinity Windows made?

Marvin Infinity Windows are manufactured in West Fargo, North Dakota.

What are some benefits of Infinity Windows?

Infinity Windows provides fiberglass replacement windows that are stronger than other composite and vinyl alternatives. These windows withstand bending and warping and won’t expand in extreme temperatures. The company’s windows are made-to-order, ensuring a perfect fit for every installation. You can customize the windows to fit your home’s decor and add the EverWood veneer for an elegant wood look.

How We Chose the Top Window Brands

We researched and analyzed dozens of window manufacturers. We then crafted a rating system based on each brand’s standard and energy-efficient product offerings.

We spoke directly to representatives at each company to learn how the installation process works and determine how each brand personalizes its windows for each home. We also closely analyzed each company’s warranty options to ensure their product and labor guarantees match or exceed industry standards. 

Finally, we assessed the manufacturer’s years of experience and customer reputation. In addition, we analyzed the 100 most recent Google Reviews for each provider across various locations and branches.