Ever wondered why modern windows keep your home warmer in winter, cooler in summer, and quieter year round? That’s thanks to insulated glass units (IGUs) — the key to better energy efficiency and comfort.
An IGU is a sealed glass system made up of two or more panes of glass, separated by spacers and filled with insulating gas. These units are used in double-pane glass and multi-pane windows, reducing heat loss and noise while allowing plenty of natural light inside.
This guide covers how IGUs work, their components, types, benefits, and where they’re used — plus expert tips for choosing the right one for your home.
Why Is It Called a “Unit”?
IGUs are considered a single, unified system because the panes are hermetically sealed along the edges. This tight seal is created with high-performance spacers and sealants that lock out moisture and contaminants.
That’s why double-pane and multi-pane windows stay effective year-round, preventing fogging and maximizing insulation. The sealed design is what makes them so durable, energy-efficient, and reliable in all kinds of weather.
Main Components of Insulated Glass Units
IGUs may look simple, but they’re engineered for maximum performance. Here’s what goes into every unit:
- Glass panes: IGUs use various types of glass, including standard, tempered, laminated, and Low-E coated for improved insulation and solar control.
- Spacer frame: Separates the panes and determines the insulating gap. Wider spacers increase efficiency but can also raise costs. Materials include aluminum, steel, and composite plastics.
- Sealant: Two layers of sealant keep the unit airtight, preventing moisture from getting in and reducing long-term wear.
- Absorber (dehumidifier): Built into the spacer frame, it absorbs moisture, preventing the windows from fogging up inside.
- Window frame: Insulated glass is used in many types of windows where efficiency is required. Bi-folding windows, panoramic windows, swing windows, and skylights use insulating glass to prevent heat loss.
- Insulating gas: The space between the panes is filled with argon, krypton, or a mix of both, adding an extra layer of insulation between indoor and outdoor temperatures.
Improve insulation, eliminate drafts, and cut down on energy costs with high-performance insulated glass windows from Aurora Doors & Windows. Schedule your free estimate now!
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Types of IGUs
While double-pane windows are the most common type of IGU, there are many other configurations available to meet specific needs:
By Number of Panes
Understanding the pane configuration is the first step in choosing the best IGU for your home. Here’s a quick look at the options:
- Double pane windows
- Triple pane windows
- Specialized IGUs
By Window Frame Type
Different window frame types have unique performance requirements, which is why choosing the correct IGU is so important.
By Glass Type
The type of glass used in your IGU is essential for determining its security, safety, and energy-saving properties. Here’s a look at common options:
- Annealed glass
- Tempered glass
- Laminated glass
- Low-E Glass
By Gas Fill
The type of gas fill matters for improving the insulating properties of your IGU and reducing heat loss. Options include:
- Air-filled
- Argon-filled
- Krypton-filled
7 Benefits of IGUs
Insulated glass units (IGUs) do more than just improve window performance — they enhance comfort, boost energy efficiency, and increase durability. Here’s a closer look at their top advantages:
1. Superior Thermal Performance
IGUs reduce heat transfer, helping your home stay warmer in winter and cooler in summer. The insulating layer of air or gas between the panes slows down temperature changes, creating a more stable indoor environment.
2. Improved Energy Efficiency
Because insulated glass windows reduce the flow of heat, they can save energy bills by making your heating and cooling systems more efficient. This is a significant energy savings and helps to reduce your home’s carbon footprint.
3. Noise Reduction
Live near a busy street or noisy neighborhood? IGUs create a sound barrier, helping block out traffic, construction, and other outside noise for a more peaceful indoor space.
4. Reduced Condensation
Properly installed IGUs are less likely to fog up than single-pane windows. The built-in moisture-absorbing technology helps prevent condensation, keeping your windows clear and streak-free.
5. UV Protection
Some IGUs come with special coatings that filter out harmful UV rays. This helps protect furniture, carpets, and artwork from fading, extending their lifespan.
6. Increased Property Value
Homes with double- or triple-pane IGUs are more desirable due to their energy efficiency, comfort, and modern appeal. Upgrading to IGUs can increase resale value while enhancing your home’s overall look.
7. Durability
Quality IGUs can last 15-20 years or more, as long as the seals remain intact. While seal failure can’t be repaired, choosing high-quality IGUs reduces the risk and extends their lifespan.
Aurora Doors & Windows is always ready to provide expert guidance and help you choose the perfect IGU solutions for your specific needs and budget. With a 10-year warranty on all our products, you can enjoy your new windows for years to come!
Location and Performance Characteristics of IGUs
IGUs can be used in various locations, including standard window units, skylights, and glass doors, especially in areas with extremely hot air or cold air where thermal performance is critical. When evaluating an IGU’s performance, consider the following:
- U-value: Measures how much heat passes through the glass. A lower U-value means better insulation.
- Solar heat gain coefficient (SHGC): Indicates how much solar radiation enters through the window. A lower SHGC means less heat gain from sunlight.
- Visible light transmittance (VLT): Shows how much natural light passes through without affecting insulation.
- Air leakage rate: A lower air leakage rate means a tighter seal, reducing drafts and improving efficiency.
- Sound transmission class (STC): Determines how well the window reduces noise. A higher STC means better sound insulation.
The efficiency of insulated glass is determined by its glass thickness and the width of the insulating gas layer. The reflective ability of the window can be improved by applying a special coating to its exterior, reflecting sunlight and preventing heat from entering the house, keeping the room pleasantly cool. If this coating is applied to the inside of the window, it helps retain heat in the house.
Aurora Doors & Windows: Beautiful Windows, Built to Last
Upgrading your home’s windows isn’t just about looks — it’s about comfort, efficiency, and durability. Insulated glass units (IGUs) are one of the smartest investments you can make if you want better temperature control, lower energy costs, and a quieter home.
By understanding how IGUs work and their benefits, you’ll be able to choose the right option for your home. These high-performance glass units help reduce heat transfer, minimize energy loss, and block out unwanted noise, making them a key feature in modern windows and doors.
If you’re ready to take the next step and explore IGUs further, Aurora Doors & Windows is your trusted partner. Contact us today to learn more about our high-quality IGUs and how they can benefit your home.
FAQ
How much does an IGU cost?
The price of an IGU depends on size, glass type, gas fill, coatings, and frame material. To get an accurate estimate, contact Aurora Doors & Windows for a personalized quote tailored to your needs.
How do I know if my IGU has failed?
A failing IGU won’t insulate as well as it should. Watch for fogging or condensation between the glass panes — this is a sign that the airtight seal has broken, allowing moisture inside. If this happens, you’ll likely need a replacement to restore insulation and visibility.
How do I clean my IGU windows?
To keep your IGUs in top shape, use mild soap and water with a soft cloth or sponge. Avoid abrasive cleaners or harsh chemicals, as they can damage the glass or coatings. Regular cleaning will help maintain clarity and extend the life of your windows.
Do I need IGUs if I live in a mild climate?
Absolutely! Even in places with moderate temperatures, IGUs help stabilize indoor temperatures, lower energy costs, and reduce outside noise. They’re a smart choice for any home looking to improve efficiency, comfort, and durability.
Invest in Comfort, Save on Energy Costs
Insulating glass units can significantly reduce your energy bills. Contact Aurora today for a free estimate and learn more about the benefits.
