Infinity from Marvin Consultant: Your fiberglass replacement windows guide

Get answers to your fiberglass replacement window questions

Shopping for replacement windows can seem confusing and time-consuming. No worries — we have everything you need to find your ideal fit quickly, easily and confidently during your free in-home consultation.

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First things first: Do you need a replacement window?


Moisture issues

If you've seen water between glass panes, leaking, water stains or evidence of wood rot - those are signs that excess moisture is accumulating where you can't see it. This can lead to damage, including mold, mildew and warping. While some condensation is normal, an excess of moisture often points to a problem.

Energy efficiency

If you need to wrap up in a blanket to sit by your windows, it may be time to switch to more energy efficient windows.

Not working properly

Older windows have a tendency to break down and often refuse to open or have a hard time closing. Save yourself the headaches and consider new options.

Download the complete Infinity Replacement 101 Guide

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Infinity from Marvin insert and full-frame window installation

Insert and full-frame fiberglass window replacements

Depending on the age and style of your home, Infinity offers two window replacement methods. Your local Infinity partner will help you determine the best solution for your home, including addressing any concerns about water or structural damage. Both methods are designed for maximum efficiency and minimal disruption to your home.

Infinity from Marvin fiberglass window

Materials matter

When replacing your windows, give careful consideration to the framing material. Infinity from Marvin uses Ultrex® fiberglass for proven, long-lasting performance.

Our Process

Infinity streamlines your entire window replacement project — from start to finish.

Expert consultation

A local independent retail partner will provide a complete consultation to determine your specific needs - including climate considerations and other factors. They will answer all your questions and provide a detailed, custom project quote based on your specifications.

A perfect fit

A measure technician will review your order, measure your openings and verify your installation needs. Your windows will then be built to your exact needs and measurements.

Seamless installation

Installation professionals will remove and dispose of your old windows and replace them with your custom Infinity windows.

Built for life®

From our Limited Lifetime Warranty to our partners' unparalleled customer service, we go above and beyond to ensure your windows always provide a lifetime of optimal performance.


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Frequently asked questions

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Have additional questions? We’re at the ready to answer anything and everything about your specific window replacement needs.

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