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Expert Double Glazing Advice

What is Insulated Glazing or IGU?

Benefits of Insulated Glazing for Energy-Efficient Homes in Leicester

Benefits of thermal glass unit

If you’re in the process of building or renovating your Leicestershire home, you’ve likely come across the term “insulated glazing.” But what exactly is insulated glazing, and why is it becoming a popular choice among homeowners? 

In this article, we’ll explore the world of insulated glazing, discussing its benefits, how it works, and why it’s an excellent investment for energy-efficient homes.

What is Insulated Glazing?

Insulated glazing involves the use of two or more glass panes separated by a gap filled with air or gas. This gap acts as a barrier that significantly reduces heat transfer between the interior and exterior of a building.

If you weren’t sure, insulated glazing (IG) is the technical term for ‘double glazing’ and ‘triple glazing’.

Read our in-depth guide for more information: What is Double Glazing? How Does it Work?

How Does Insulated Glazing Work?

The secret behind the efficiency of thermal glazing lies in its construction. The gap between the glass panes acts as an insulator, preventing heat from escaping during the colder months and blocking unwanted heat from entering during warmer months. 

Additionally, some thermal glazing units contain a special gas, such as argon or krypton, between the panes. These gases have a higher density than air, further improving the insulation properties of the windows.

What is insulated glazing IGU

At Phair Windows & Glass, we’re a leading window company serving customers across Leicestershire and the East Midlands. Find out more information about our IGU services, or contact us for a free quote.

How Long Does Insulated Glass Last?

Insulated glass is designed to be durable and long-lasting. On average, well-maintained insulated glass windows can last around 20 to 25 years or even longer.

However, the lifespan can vary depending on several factors such as the quality of the materials used, the installation process, the local climate, and how well the windows are maintained over time.

Regular maintenance, including cleaning the glass surfaces, inspecting and maintaining the seals, and addressing any issues promptly, can significantly extend the lifespan of insulated glass windows. Proper care helps prevent moisture buildup between the panes, which can lead to condensation and reduced insulation efficiency.

Related: How Long Does Double Glazing Last?

The Benefits of Insulated Glazing

Improved Energy Efficiency

One of the primary reasons homeowners opt for insulated glazing is its remarkable energy-saving capabilities, especially as over 25% of heat escapes through windows.

By minimising heat transfer, insulated glazing helps maintain a consistent indoor temperature, reducing the need for constant heating or cooling. This, in turn, leads to lower energy bills and a reduced carbon footprint.

Improved energy efficiency with insulated glazing

Enhanced Comfort

Thanks to efficient temperature regulation, rooms with insulated glazing stay more comfortable throughout the year. Say goodbye to cold drafts near windows during winter or the unbearable heat seeping in during summer.

Noise Reduction

Insulated glazing doesn’t just stop at temperature control—it also provides excellent noise reduction. The multiple layers of glass and the insulating gap work together to dampen external noises, creating a quieter and more peaceful living environment.

Condensation Control

Traditional single-pane windows are more prone to condensation buildup, which can lead to mould and mildew issues. Insulated glazing significantly reduces condensation by maintaining a balanced temperature on the inner glass pane, ensuring a healthier indoor environment.

Increased Property Value

Investing in energy-efficient features like insulated glazing can boost your property’s value. Potential buyers are increasingly drawn to homes that are equipped with sustainable and cost-effective solutions.

Read our guide for more advantages of insulated glass: 10 Double Glazed Windows Benefits

Installation Process

Choosing the Right Insulated Glazing

Selecting the appropriate type of insulated glazing depends on factors like climate, budget, and aesthetic preferences. Consult with experts to determine the best fit for your home.

Professional Installation

While some experienced DIY enthusiasts might consider installing insulated glazing themselves, it’s recommended to hire professionals. Proper installation ensures the windows perform optimally, seals are airtight and reduces double glazing failure.

Double glazing failure on window

Ensure that you always choose an accredited and highly recommended insulated glazing installer such as Phair Windows & Glass. If you’re not sure what to look out for when choosing an installer, take a look at our guide on how to choose the best double glazing company.

Maintaining Insulated Glazing

Cleaning Tips

Maintaining insulated glazing is relatively simple. Regularly clean the glass surfaces with a mild glass cleaner and a soft cloth to keep them looking clear and attractive.

Preventing Damage

Avoid using abrasive materials or sharp tools that could scratch or damage the glass. Inspect the seals for signs of wear and tear and address any issues promptly to maintain the insulating properties.

Is Insulated Glazing Worth It?

Long-Term Savings

While the initial cost of installing insulated glazing might be higher compared to traditional windows, the long-term savings on energy bills make it a financially prudent choice. The energy efficiency translates into reduced heating and cooling expenses.

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Environmental Impact

By reducing energy consumption, insulated glazing contributes to a more sustainable lifestyle. Lower energy usage means fewer greenhouse gas emissions, helping to mitigate climate change.


Incorporating insulated glazing into your home is a smart move that offers a wide range of benefits. From energy savings and improved comfort to noise reduction and increased property value, insulated glazing proves its worth on multiple fronts. By making this investment, you’re not only enhancing your quality of life but also playing a role in creating a greener future.

If you would like a free quote on replacement windows in Leicestershire, get in touch with our experts. As a leading windows and door installer, we have the experience and expertise to assist with your new insulated glass windows.

Frequently Asked Questions (FAQs)

What exactly is insulated glazing?

Insulated glazing, also known as double glazing, is a window construction method that uses multiple glass panes with an insulating gap in between to enhance energy efficiency and other benefits.

How does insulated glazing improve energy efficiency?

The insulating gap and specialised gases between the glass panes reduce heat transfer, leading to better temperature regulation and decreased reliance on heating and cooling systems.

What is the IGU glass?

IGU glass, or Insulated Glass Unit, consists of two or more glass panes separated by an insulating gap, enhancing energy efficiency and reducing heat transfer for improved comfort and insulation.

What does IG mean in glazing?

In glazing, “IG” stands for “Insulating Glass.” It refers to a construction technique where two or more glass panes are sealed with an insulating spacer to enhance energy efficiency and comfort.

What is the difference between glass and insulated glass?

Glass is a single pane of transparent material, while insulated glass comprises two or more glass panes separated by an insulating spacer, enhancing energy efficiency, noise reduction, and insulation in buildings.

What is insulated glass used for?

Insulated glass is used for windows and doors in buildings. Its multiple glass panes and insulating gap reduce heat transfer, enhancing energy efficiency, noise reduction, and indoor comfort.

Can I install insulated glazing on my existing windows?

In most cases, yes. Insulated glazing units can often be retrofitted to replace existing single-pane windows, offering an energy-efficient upgrade.

Is insulated glazing suitable for all climates?

Yes, insulated glazing is beneficial for all climates. It helps keep interiors comfortable by preventing heat loss in cold climates and minimising heat gain in hot climates.

How do I find a reliable professional for insulated glazing installation?

Research local contractors or companies with experience in window installation and insulation. Check reviews, ask for recommendations, and request quotes to find the right fit for your project.

What is Insulated Glass?

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