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If you are considering a home renovation project, you are probably looking to upgrade to a product that provides reliable performance but looks great at the same time. This definitely holds true when looking for a window replacement. Style, design, function, and performance will all be factors you consider before purchasing your replacement windows.

Before you make your final decision on your new windows, it is good to consider some factors that can affect the performance of your windows.

Below we look at 4 essential factors that can determine the performance of a window.

Frame Material

When it comes to a window’s performance, the frame is the first factor you must consider. Overall, window frames are made with a wide range of materials, and each material comes with different pros and cons.

Let’s check out a couple of common materials.


Wood has been utilized to frame windows for a long time, and it is still a popular choice today because of its natural beauty. Another benefit of wood frames is that they provide exceptional insulation value and are a great sound barrier.  On the downside, wood is susceptible to rot over time, so it does require more maintenance than the alternatives.


When compared to other frame materials, vinyl frames are probably the most affordable choice on the market. In addition, they are known for being extremely energy efficient and very low maintenance. A big letdown of vinyl is that you do not have much flexibility with the design of the windows. They do come in a variety of colour choices, however darker shades have been known to fade over time.

Energy Efficiency

The design of your windows plays an important role in their energy efficiency level. Here are some common designs and how they affect the energy efficiency of a window:

Picture Windows

The panes of glass on these window types do not open, hence no air leakage as these windows are air-tight. This helps increase their energy efficiency. Subsequently, you can get a triple-glazed fixed window or an argon gas-filled window to help increase the energy efficiency of the window.

Double-Hung Windows

These traditionally styled windows allow for both sashes to slide horizontally. When closed they offer a tight seal, however over time, they may suffer higher air leakage rates than other window styles.

Casement windows

Are known to close airtight as their sash closes by pressing against the frame. If you live in regions with lots of wind, casement windows are great options for you.  As long as their seals and hinges are in good condition, casement windows have lower air leakage rates than many other window styles.

Inside the glass

Another crucial factor that will determine the performance of a window is what is inside the glass. Compared to a single-pane window, a Low-E, double-paned window filled with argon gas will offer more insulation. The content of the window ensures that your home is protected against the effects of the scorching sun and its UV rays.

It is good to note, for more energy efficiency, you may want to go for triple-paned windows. However, they come with lower light transmittance and visibility.


Last but not least, the installation of a window will play a key role in determining its performance. Irrespective of the cost, design, or components of a window, poor installation will lower its performance significantly. So, you should ensure the caulking, flashing, and other parts of your window installation are done properly.

To prevent any issue, you are advised to hire an experienced window and door replacement contractor. Such a contractor will understand the intricacies involved with installing replacement windows and achieving the best performance.

If you are interested in replacing your windows and doors, let ThermoBILT windows and doors help you get started. Call us today at 866-512-4782.