Home Blog Windows Discover Infinity Windows by Marvin from Mainstream Home Improvement

By Mainstream Home Improvement on July 8, 2025

At Mainstream Home Improvement, we’re always looking for ways to bring the best products and services to homeowners in the Quad Cities. That’s why we’re proud to announce that we are now offering Infinity Windows by Marvin – a premier line of fiberglass replacement windows engineered for strength, beauty, and performance. If you’re exploring window replacement options for your home, this exciting addition is the perfect opportunity to discover the future of window innovation.

The Basics: Vinyl vs Fiberglass Windows

Before diving into the advantages of each, it’s important to understand how these two popular window materials differ at the core:

  • Vinyl Windows: Made from polyvinyl chloride (PVC), vinyl windows are lightweight, non-corrosive, and often more affordable than other materials. They are commonly used in residential settings due to their low maintenance and solid insulation properties.
  • Fiberglass Windows: Made from strong glass fibers embedded in a resin matrix, fiberglass windows are engineered for maximum durability. Infinity Windows by Marvin are crafted using Ultrex® fiberglass, a patented material designed to resist warping, swelling, and weathering in even the most extreme Midwest climates.

Why Infinity Windows by Marvin Lead the Way

With Infinity Windows now available from Mainstream Home Improvement, homeowners have access to a game-changing window solution. Here’s what makes Infinity fiberglass windows stand out from the competition:

  • Strength and Durability: Ultrex fiberglass is 8 times stronger than vinyl, offering unmatched resistance to temperature extremes, moisture, and impact. This translates to a longer lifespan with fewer repairs or replacements down the line.
  • Slimmer Frames, Bigger Views: Because fiberglass is so strong, Infinity Windows can be built with narrower frames without sacrificing performance. That means more visible glass and more natural light for your living spaces.
  • Superior Finish and Appearance: Infinity’s proprietary acrylic finish is fade-resistant and built to last. Unlike vinyl, which can warp, chalk, or discolor over time, Ultrex maintains a consistent appearance that won’t fade in the harsh summer sun or peel during winter freezes.
  • Energy Efficiency: Infinity fiberglass frames expand and contract at nearly the same rate as glass. This reduces seal failure and helps maintain consistent insulation, keeping your home more comfortable year-round and potentially lowering energy bills.
  • Low Maintenance: Forget painting, scraping, or touch-ups. Infinity Windows are designed to be maintenance-free, with a factory finish that resists wear and doesn’t require regular upkeep.

Comparing Vinyl and Fiberglass Replacement Windows

When deciding between vinyl and fiberglass replacement windows, it’s helpful to weigh the specific benefits of each material based on your home’s needs and your long-term goals.

Durability and Lifespan

  • Vinyl: While vinyl doesn’t rot or rust, it can expand, contract, and become brittle over time – especially in climates with wide temperature swings like we see in the Quad Cities.
  • Fiberglass: Infinity’s Ultrex fiberglass is stronger and more stable, providing decades of reliable performance with minimal maintenance.

Energy Efficiency

  • Vinyl: Offers good insulation, but may lose effectiveness over time due to seal failure or frame distortion.
  • Fiberglass: Because it expands at nearly the same rate as the window glass, fiberglass maintains a tighter seal, ensuring long-term energy savings.

Aesthetics

  • Vinyl: Often thicker in profile and limited in color choices. Some styles may appear bulky or less refined.
  • Fiberglass: Slimmer frames offer a more modern, clean look with expanded glass area. Infinity Windows come in a range of interior and exterior finishes that mimic the look of real wood, without the maintenance.

Cost and Value

  • Vinyl: Generally less expensive upfront, making it a budget-friendly choice for many homeowners.
  • Fiberglass: While the initial cost is higher, the return on investment is greater due to the superior performance, longevity, and energy savings over time.

Why Mainstream Home Improvement Is Your Trusted Partner

For over two decades, Mainstream Home Improvement has helped thousands of homeowners across the Quad Cities improve their properties with high-quality windows, roofing, siding, and gutters. With the introduction of Infinity Windows by Marvin, we’re offering even more value and durability to homeowners who want the best.

Our experienced team works closely with each client to assess their needs, walk through all available options, and ensure flawless installation from start to finish. We understand that every home is different, and every homeowner deserves windows that enhance comfort, curb appeal, and efficiency.

Whether you’re upgrading a few windows or replacing them throughout your home, we’re here to help make the process smooth, informed, and stress-free.

Contact Us Today

If you’re considering new windows for your home, now is the perfect time to discover the difference that Infinity Windows by Marvin can make. Backed by advanced materials, tested durability, and timeless design, these fiberglass windows provide lasting beauty and reliable performance that vinyl simply can’t match. Contact Mainstream Home Improvement today at (309) 762-6244 to schedule your free estimate and find out why more Quad Cities homeowners are choosing Infinity Windows by Marvin.

Request A Free Estimate