When it comes to choosing replacement windows that balance timeless design with long-term durability, Marvin is a name that consistently rises to the top.
But within the Marvin family, one product line stands out: Infinity® from Marvin.
Homeowners across the country consider Infinity a premium option for several reasons. It starts with the proprietary Ultrex® fiberglass, which is stronger and more stable than vinyl, wood, or composite alternatives. But it's not just about strength—Infinity windows offer sleek, clean lines, energy-efficient glass packages, and elegant customization options that elevate the look and feel of any home.
In this complete guide, we’ll walk you through everything you need to know about Infinity from Marvin—from the materials and style options to energy performance, pricing, installation, and beyond. Whether you’re replacing a single window or updating your entire home, this guide will help you decide if Infinity is the right choice for your next project.
The core mission of Infinity is simple: to provide homeowners with a better window replacement experience from start to finish. From the first consultation to the final installation, Infinity is available exclusively through a select network of local, independent dealers. These dealers are carefully chosen and trained to ensure that homeowners receive not only top-quality products but also exceptional service and support throughout the process.
One of the things that sets Infinity apart within the Marvin family is its singular focus. While Marvin Signature®, Elevate®, and Essential® lines offer a broad range of solutions for different construction needs and budgets, Infinity is laser-focused on replacement. Here’s a quick breakdown:
Infinity from Marvin is built entirely with Ultrex® fiberglass. Ultrex isn’t your average fiberglass. It’s a pultruded fiberglass, which means it’s made by pulling strands of strong glass cables through a resin and curing them into rigid, incredibly durable shapes. In short: it’s engineered to last.
Infinity windows have been installed in homes across the country for over 20 years, and many original installations still look and perform like new. In fact, Marvin has tested Ultrex for over 4,000 thermal cycles (heat/cold)—and it still maintains structural integrity where others fail. That means no sagging frames, no broken seals, and no loss of energy efficiency.
Infinity from Marvin windows aren't just durable, they're beautiful. Whether you live in a modern farmhouse in the Hill Country or a traditional brick home in San Antonio, Infinity offers the design flexibility to match your aesthetic and meet your home’s unique needs.
Unlike mass-produced windows that are pulled off a shelf and cut to fit, every Infinity window is made to order. That means each one is precision-built to the exact dimensions of your existing window openings—no gaps, no fillers, and no compromises. This level of custom craftsmanship ensures a cleaner look, a tighter seal, and a more energy-efficient installation.
This is a big win for those of us who live in Texas, where oversized windows, arched tops, and custom shapes are more common than in other parts of the country.
From traditional to contemporary, Infinity offers a wide variety of window styles to fit every room and every design preference:
Grid Patterns: Choose from Simulated Divided Lites (SDLs), Grilles Between the Glass (GBGs), or custom grille patterns to match the architectural style of your home.
Hardware Finishes: From classic oil-rubbed bronze to contemporary brushed chrome, Infinity’s hardware finishes complement any interior palette.
Color Selections:
In Texas, we don’t just want energy-efficient windows—we need them. Between the intense summer heat, constant sun, and fluctuating temperatures, your windows have to do a lot more than look good. That’s why energy efficiency is one of the biggest selling points of Infinity from Marvin.
These windows are engineered to keep your home comfortable year-round, lower your utility bills, and perform well for decades, not just the first few years.
Let’s break down the two most important numbers:
Infinity windows offer excellent ratings in both categories and are certified by ENERGY STAR®, meeting or exceeding efficiency standards across all U.S. climate zones—including the Southern and South-Central zones that cover most of Texas.
A huge part of Infinity’s superior energy performance comes from its use of Cardinal Glass Insulated Glass Units—one of the highest-quality glass systems available in the industry.
Most window companies use generic IGUs that perform decently at first but degrade quickly. Over time, seals break down, insulating gases leak out, and efficiency drops—sometimes within just a few years.
Cardinal IGUs are different. They feature:
The result? These glass units are designed to maintain their seals and energy performance for decades, not just the short-term. That means the efficiency you see on day one is the same efficiency you’ll have ten, fifteen, even twenty years down the line.
Infinity windows also include high-performance Low-E (low emissivity) coatings, which are ultra-thin layers of metallic oxide that reflect heat and harmful UV rays. You get:
When you combine Infinity’s Ultrex® fiberglass frames with Cardinal’s premium IGUs and Low-E glass, you get a window that beats out the vast majority of products on the market - and that will keep your energy bills low for decades.
When you invest in replacement windows, you want the peace of mind that they’re going to last—and that the company behind them will stand by their product. That’s yet another reason to choose Infinity from Marvin.
Infinity offers a Limited Lifetime Warranty that’s among the most comprehensive in the industry. Here’s what’s included:
Like any warranty, there are limits:
But for the vast majority of homeowners who have their Infinity windows installed by a certified dealer (which is the standard process), the warranty coverage is robust and reliable.
While the warranty is “limited lifetime,” the actual expected lifespan of Infinity windows is where they really shine. Thanks to the durability of Ultrex® fiberglass and the long-term performance of Cardinal IGUs, these windows can easily last 50 years or more with minimal maintenance. In fact, Marvin often calls them, "windows for life."
Let’s put that in perspective:
In other words, while other windows might need to be replaced once (or even twice) in your lifetime, Infinity is likely the last window replacement you'll ever need.
Infinity from Marvin sits in the premium tier of the replacement window market, but many homeowners find the investment well worth it for a window that lasts half a lifetime.
On average, you can expect Infinity windows to cost between $2,000 and $3,000 per window, fully installed. That range can vary depending on the style, size, and complexity of the job.
Several key variables influence the final cost of your Infinity window project:
Infinity typically offers more durability and lower maintenance than wood or composite, often at a lower price than Renewal by Andersen, while still delivering high-end energy performance and custom design flexibility.
In short, Infinity isn’t the cheapest option—but it may be the best long-term value. With lower maintenance, longer lifespan, and better materials, it’s an investment that pays off in comfort, energy savings, and resale value.
As great as Infinity windows are, there are always tradeoffs.
Infinity’s proprietary Ultrex® fiberglass is one of the strongest window materials available—8x stronger than vinyl and far more stable than wood or composite. That means your windows will resist warping, cracking, swelling, and shrinking—even in the intense heat, sun, and seasonal shifts we see here in Texas.
With thinner frames and sleek sightlines, Infinity windows let in more natural light and give your home a more modern, refined look—without the bulkiness of typical vinyl frames. They’re a great match for both traditional and contemporary architecture.
Infinity’s acrylic finish is factory-applied and bonded to the fiberglass for long-term performance. It doesn’t chip, fade, or peel like painted wood, and unlike vinyl, it doesn’t require constant upkeep. A quick rinse is usually all you need to keep them looking like new.
The Limited Lifetime Warranty covers the frame, glass seals, and hardware—providing long-term peace of mind. It’s also transferable if you sell your home, which can be a selling point down the road.
Compared to budget vinyl windows, Infinity does come with a higher price tag. But it’s a classic case of getting what you pay for. While the upfront cost is more, the long-term value, durability, and energy savings often make up for it over time.
Infinity is sold exclusively through a network of hand-selected dealers, meaning you can’t pick it up at your local home improvement store. That ensures better quality control and installation—but it also means fewer buying options and limited price-shopping.
Now that we’ve broken down the features, styles, performance, and price, the big question is: Is Infinity the right window for your home? Like any premium product, it isn’t a one-size-fits-all solution—but it can be a perfect fit for the right homeowner.
If you want a custom-made window solution that looks amazing, performs exceptionally, and lasts for decades, Infinity from Marvin is one of the top choices on the market.
Still unsure? A consultation with your local Infinity dealer can help you explore styles, pricing, and options tailored to your home and your goals.
By now, you’ve seen what makes Infinity from Marvin one of the top choices for homeowners who care about long-term value, modern design, and hassle-free performance. But reading about windows can only take you so far—the next step is seeing how they can transform your home.
Here’s How to Get Started
If you’re ready to invest in windows that are custom-built, beautifully designed, and engineered to last a lifetime, let’s get started.
Schedule your free, no-obligation consultation today and see what Infinity from Marvin can do for your home.