Windows are an essential feature of any home. They allow natural light to enter and provide a view of the outdoors. However, they can also be a significant source of energy loss, leading to higher energy bills and reduced comfort levels. The solution? Energy-efficient windows. This article will explore what makes a window energy efficient and why it’s essential to consider when selecting windows for a home.


Understanding energy efficiency in windows

Before delving into the details of what makes a window energy-efficient, it’s essential to understand the concept of energy efficiency itself. Simply put, it refers to the ability of a product to perform its function while using minimal energy. In the windows context, energy efficiency means that the window can keep the desired temperature inside the home while minimizing energy loss.

The importance of energy efficiency

Energy efficiency in windows is crucial for several reasons. Firstly, it can significantly reduce energy bills by minimizing the energy needed to heat or cool a home. This can be especially important when the heating or cooling system works overtime in extreme weather conditions. With energy-efficient windows, homeowners can save money on their energy bills and put those savings toward other expenses.

Secondly, energy-efficient windows can increase the comfort level of a home by reducing drafts and keeping temperatures consistent. This can be especially important during the winter when cold air can seep in through poorly insulated windows, making the home feel chilly and uncomfortable. By having energy-efficient windows, homeowners can enjoy a more comfortable living space all year round.

Thirdly, energy-efficient windows can reduce the environmental impact of a home by lowering the carbon footprint. Energy-efficient windows can help reduce greenhouse gas emissions and promote a more sustainable future by minimizing the energy needed to heat or cool a home. This can be especially important for environmentally conscious homeowners who want to do their part to protect the planet.

How windows contribute to energy loss

A window can contribute to energy loss in several ways. Firstly, they can let the unwanted cold or hot air into the home, leading to an inefficient heating or cooling system. This can be especially problematic during extreme weather conditions when the heating or cooling system works overtime to maintain a comfortable temperature. By having energy-efficient windows, homeowners can minimize the energy needed to maintain a consistent temperature inside the home.

Secondly, windows can allow heat energy to escape through the window panes. This can be especially problematic during winter when the temperature outside is much colder than inside the home. By having energy-efficient windows, homeowners can minimize the heat energy that escapes through the window panes, keeping the home warmer and more comfortable.

Thirdly, windows can create condensation, damaging the window frame and seal. This can be especially problematic in areas with high humidity levels or during the winter months when the temperature difference between the inside and outside of the home is significant. By having energy-efficient windows, homeowners can minimize the amount of condensation that forms on the windows, reducing the risk of damage to the window frame and seal.

Overall, understanding energy efficiency in windows is crucial for homeowners who want to save money on their energy bills, enjoy a more comfortable living space, and reduce their environmental impact. By investing in energy-efficient windows, homeowners can reap the benefits of a more sustainable and cost-effective home.


Components of an energy-efficient window

Now that we understand why energy efficiency is essential, let’s explore the components of an energy-efficient window.

Glass and glazing options

The type of glass used in a window can significantly impact its energy efficiency. For example, double-glazed windows have two panes of glass with a layer of insulating air or gas in between, making them more efficient at reducing heat loss. Another option is low emissivity (Low-E) glass, coated with a thin, transparent layer reflecting heat energy while allowing light to enter.

However, the glass and glazing used in a window is not the only factor contributing to its energy efficiency. The orientation of the window also plays a significant role. South-facing windows, for example, receive the most direct sunlight and can contribute to passive solar heating in the winter. East and west-facing windows, on the other hand, receive direct sunlight in the morning and afternoon, respectively, and can contribute to unwanted heat gain in the summer.

Frame materials and design

The material and design of the window frame also contribute to its energy efficiency. Vinyl, fiberglass, and wood are popular for energy-efficient windows. Each material has different performance characteristics, and proper installation is critical to ensure maximum energy efficiency.

Window frames can also be designed to improve energy efficiency. For example, frames with thermal breaks, which are insulating materials between the interior and exterior of the frame, can reduce heat transfer and improve energy efficiency. Also, frames can be designed to minimize air leakage, accounting for up to 30% of a home’s heat loss.

Spacer bars and gas fills

The space between the panes of a double-glazed window can be filled with an insulating gas, such as argon or krypton, to further increase energy efficiency. Additionally, spacer bars, which separate the panes of glass, can be made from materials that reduce thermal conductivity to minimize heat transfer through the window.

However, not all gas fills and spacer bars are created equal. Some manufacturers use low-quality materials that can degrade over time and reduce energy efficiency. It’s important to choose a reputable manufacturer and installer to ensure that your windows are truly energy-efficient.


Window performance ratings

Understanding window performance ratings is essential when selecting energy-efficient windows. Several ratings determine the energy efficiency of a window.


The U-factor measures the rate of heat transfer through the window. The lower the U-factor, the better the window reduces heat loss.

Solar heat gain coefficient (SHGC)

The SHGC measures the amount of solar radiation that passes through the window. A lower SHGC means less solar radiation, which is beneficial in hot climates but not ideal in cooler climates.

Visible transmittance (VT)

The VT measurement represents how much visible light passes through the window, measured on a scale from 0 to 1. A higher VT allows more light to enter the home.

Air leakage (AL)

The AL measurement indicates the rate of air movement around the window frame. A lower AL means less air movement and better energy efficiency.


Benefits of energy-efficient windows

Now that we have explored what makes a window energy-efficient let’s discuss the benefits of installing them in a home.

Reduced energy bills

Energy-efficient windows can dramatically reduce energy bills by minimizing the heat lost or gained through windows. This reduction in energy use can lead to significant cost savings over time.

Improved comfort

Energy-efficient windows can make a home more comfortable by reducing drafts by maintaining a consistent temperature.

Lower environmental impact

Energy-efficient windows also lower a home’s carbon footprint by reducing energy use, making them a sustainable choice for environmentally conscious homeowners.

Increased home value

Finally, installing energy-efficient windows can increase the value of a home, making them a wise financial investment. It’s a feature that many homebuyers seek when purchasing a home.


Energy efficiency is an essential consideration when selecting windows for a home. The components of an energy-efficient window include glass and glazing options, frame materials and design, and spacer bars and gas fills. Understanding window performance ratings is also fundamental when selecting energy-efficient windows. Energy-efficient windows offer many benefits, including reduced energy bills, improved comfort, lower environmental impact, and increased home value. Installing energy-efficient windows is an excellent place to start for homeowners looking to boost their home’s energy efficiency.

Contact us at 903-752-0449 to discuss Energy Star window pricing and availability.

Our service area includes the following towns: Tyler, Whitehouse, Bullard, Lindale, Chandler, Canton, Mineola, Longview, Kilgore, Henderson, Gilmer, Gladewater, Marshall, Hallsville, and Palestine.