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fiberglass vs vinyl windows

Trying to decide between fiberglass and vinyl windows? The windows you choose for your home can make a huge difference in the way it looks, performs, and lasts. At the same time, windows are an investment you make in your home, and you want that investment to pay off over time.

Fiberglass vs Vinyl Windows

Consider these factors when making your selection.


Fiberglass windows win the contest of strength over vinyl windows. In fact, they’re 8 times stronger than vinyl. That means they’re going to last well and retain their beautiful appearance for a longer time. They’re more stable in the long run than vinyl windows and resist corrosion, warping, and denting.

Weather Resistance

When you choose fiberglass, you get the benefit of windows that hold up better to harsher weather conditions. These windows are strong enough to handle high heat or freezing cold temperatures without warping or becoming brittle. Vinyl windows do resist weather damage as well, although not to the extent that fiberglass windows do. Both types resist rot much better than wood windows.


You’ll want your windows to be sealed tightly and maintain that tightness over the years. New vinyl windows are much tighter than old, worn wood windows. However, fiberglass windows are even tighter. They don’t leak air, keeping your home warmer and eliminating uncomfortable drafts. With both types of windows, professional installation ensures that they have the tightest fit possible.

Energy Efficiency

Windows that are tight naturally save energy. After all, if you have a cold draft from a leaky window, your furnace is going to have to work harder. Energy transfer is another important metric when comparing energy efficiency. Fiberglass windows have very low heat transfer, so the warm air stays inside in the winter and the cool air stays in the summer. Some vinyl, as well as fiberglass windows, have insulation, which gives them better thermal performance. However, uninsulated vinyl windows are far less energy efficient.

Design Features

New vinyl windows can improve the appearance of your home dramatically. Still, they do look exactly like what they are. Fiberglass windows can be made to look like a traditional wood windows but with all the advantages of a stronger, more modern material. And, because they’re very strong for their weight, they can be designed with a narrower profile and with fascinating details reminiscent of fine wood windows.


Either type of window may look great on your home right now, but what happens if you re-side your house with a different color? In this contest, fiberglass wins. It’s much more versatile because it can be repainted to match or coordinate with your siding no matter what the new color is.

Short-Term and Long-Term Cost

The immediate cost of vinyl windows is much less than the fiberglass type. In fact, vinyl can be as much as 50% less than the cost of fiberglass. So, if you’re trying to stay within a tight budget, vinyl may be your best option. But if you have the means to buy either type, then it makes sense to think of the long-term cost. Because fiberglass windows are so strong and durable, they will likely last longer. A home exteriors expert can help you calculate the cost per year for both types of windows.

Final Words

Choosing new windows for your home can be a tough decision. That’s why it’s a good idea to set up a consultation with a windows expert before you buy. At GS Exterior Experts, a Colorado window installer, we can discuss your needs and recommend the windows that are most likely to meet your needs. Simply call us at (720) 683-6288 or drop us a line on our Contact page. When you have all the facts, you can choose the windows that are perfect for your home and your situation.

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