The Many Benefits of Fiberglass Windows

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When you’re looking for new windows for your home, fiberglass probably comes up as an option. This is because they are one of the most popular window materials available today. However, the cost of fiberglass windows might cause some people to pause before purchasing them. In addition, the truth is that there is no single window material that is best for every situation. Different environments, budgets, and more can all lead to different decisions when it comes to a home’s windows. Keep reading to better understand the pros and cons of fiberglass windows and decide whether they are the best choice for your home.

Fiberglass Windows

What Are Fiberglass Windows?

Fiberglass window frames are made up of two main components: glass fibers and resin. These materials are bonded together in order to create durable and weather-resistant window frames. Each window manufacturer uses a slightly different process but the result is always the same– strong windows that resist warping, rotting, and decay.

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Fiberglass Windows Pros and Cons

If you’re wondering whether fiberglass windows are the right choice for your Alhambra home, let’s take a closer look at fiberglass windows’ pros and cons.

Not Affected by Temperature

Some window materials can be seriously affected by changes in temperature. For example, they may melt under a lot of heat or they may become brittle and break in the cold. However, this is not a problem when it comes to fiberglass windows. Your windows will maintain their tight seal and resist leaks since temperature changes will not cause shrinking, swelling, or sagging. This is a huge benefit in areas that undergo high temperatures like Alhambra or other Arizona areas.


Water can cause serious problems for homes, especially a home’s windows. Fortunately, fiberglass windows are waterproof. This means that there is no chance for water to cause rot, mold, or swelling in your windows. Plus, fiberglass window frames also don’t have any seams, which eliminates the risk of collecting unwanted gunk.


Put simply, fiberglass window frames are strong. In fact, they are eight times stronger than vinyl windows! This is all thanks to the glass fibers within the window frame to reinforce it. Wind, hail, and other causes of impact are no longer something to fear when you have fiberglass windows. 


People often say that fiberglass windows can last a lifetime. This is because some studies have shown fiberglass is expected to last up to 50 years! Most fiberglass windows also come with warranties that often last for twenty years or as long as you own your Alhambra home. Ultimately, this makes fiberglass a great option if you want to replace your windows once and never have to worry about it again!

Low Maintenance

Compared to wood windows specifically, fiberglass windows are very low maintenance. You will never have to remember to stain or seal your windows again, since they are built to hold up against all kinds of weather so well.

Energy Efficiency

Another great benefit of fiberglass is that the material doesn’t expand or contract. It also does not transfer heat or cold, making it a great insulator. When living in an area like Phoenix where temperatures can vary so widely, temperature control is very important. That’s often why fiberglass is recommended to homeowners. Comparing fiberglass and vinyl windows, fiberglass is about 15% better at insulating your home. It is also less likely to form air gaps than vinyl windows, making them 30% more energy efficient.

Many Color and Style Options 

You’ll never have to worry about sacrificing visual appeal for functionality with fiberglass windows. They come in a huge variety of styles and colors, allowing you to choose the one that best matches your home. And if your style changes over time, fiberglass window frames can be painted. This is a benefit that other window materials, such as vinyl, cannot offer.


We can’t discuss the pros of fiberglass windows without also discussing their cons. With so many incredible benefits, it’s easy to see why fiberglass windows are one of the most expensive window types out there. You can typically expect fiberglass windows to cost between 10% and 30% more than other window types. 

Needs Sun Protection

Fiberglass windows do a great job of keeping hot temperatures outside. But that doesn’t mean they are not affected at all by the sun itself. The material is vulnerable to ultraviolet (UV) rays from the sun, so you will need to ensure the windows have a protective UV coating if you want them to keep looking their best for their entire lifespan. Luckily, most window manufacturers automatically include a protective coating during the manufacturing process.

Require Professional Installation

Unlike other types of windows, fiberglass window frames are very rigid. During the installation process, this makes precision extremely important. If you were hoping to do some DIY installation to save money, you should think again. Sacrificing the quality of installation could lead to huge expenses down the road. When purchasing fiberglass windows, it’s always best to leave the installation to the professionals.

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Are Fiberglass Windows Right for You?

Ultimately, the decision is up to you! There are two main factors homeowners tend to consider when making their choice. The first is the appearance of the windows. Depending on the style of your home’s interior or exterior, you might find another window material to be a better fit. The second factor is their price. As previously mentioned, fiberglass windows are one of the more expensive options on the market. While you do get superior strength and durability, the cost of fiberglass windows might leave you simply unable to afford them. 

If you’re still unsure whether you should choose fiberglass windows or another material for your home, reach out to AZ Valley Windows. You’ll quickly understand why we are considered the best window replacement company for the Alhambra area.

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