What is Double Glazing? A Guide for New Zealand Homeowners

If you have ever felt the chill coming through your windows in winter or struggled to keep your home cool during summer, you've probably heard about double glazing. But what exactly is double glazing, and why are so many New Zealand homeowners utilising? At HomePlus, we supply and install Winterglaze Retrofit Double Glazing and Secondary Glazing solutions nationwide, enabling homeowners to create warmer, healthier, quieter, and more energy-efficient homes without necessarily replacing their existing windows.

Many New Zealand homes still have single glazing as many existing houses were built before modern insulation and glazing standards were introduced and thousands of homes still rely on older single-pane windows that allow significant heat loss and can contribute to condensation and uncomfortable indoor temperatures.

The good news is that you don't necessarily need to replace all your window joinery to enjoy the benefits of double glazing.

What Is Double Glazing? Double glazing consists of two panes of glass separated by a sealed gap of air or insulating gas. This gap acts as a thermal barrier and reduces the heat transfer between the inside and outside of a home. Compared to traditional single-pane windows, double glazing significantly improves insulation, to help your home retain warmth during winter and reducing heat gain during summer. The result is a more comfortable living environment all year round, with less reliance on heating and cooling systems.

Winterglaze Retrofit Double Glazing is designed specifically for existing aluminium windows and doors and replaces original single-pane glass with a high-performance Insulating Glass Unit (IGU). Depending on the window type, some components of the existing joinery may be modified or upgraded to accommodate the new double-glazed units. Retrofit double glazing allows homeowners to achieve the benefits of modern double glazing while retaining much of their existing window framework.

What Is Secondary Glazing? For some properties can be an effective and involves installing a second pane of glass or acrylic panel on the interior side of an existing window. The air gap between the original window and the secondary panel creates an insulating barrier that helps reduce heat loss, condensation, and external noise. It is often an excellent solution for homes where retrofit double glazing may not be practical or where homeowners want a minimally invasive upgrade.

The Benefits of Double Glazing

Improved Thermal Comfort: Single-glazed windows accounts for a significant amount of heat loss. The creation of an insulating barrier with double glazing helps maintain a more consistent indoor temperature, making your home warmer in winter and cooler in summer.

Greater Energy Efficiency: Less heat escaping in colder months and less heat entering during warmer, heating and cooling systems won't need to work as hard. This helps reduce energy consumption and improve overall efficiency.

Reduced Condensation: Condensation forms when warm, moist indoor air meets a cold window surface. Double glazing keeps the internal glass pane warmer, to reduce condensation, which can contribute to mould and mildew issues.

Noise Reduction: The additional layer of glass and insulating gap can help reduce external noise, making your home quieter, particularly if you live near busy roads, schools, or urban areas.

UV Protection: Many modern double-glazed units can reduce the amount of harmful UV rays entering your home, helping protect furnishings, flooring, and artwork from fading.

Increased Property Appeal: Energy-efficient features are increasingly desirable for homebuyers. Upgrading to double glazing can enhance comfort today and potentially add value to your property in the future.

Nationwide Support from HomePlus

Achieving a warmer, healthier home has never been easier and HomePlus supplies Winterglaze Retrofit Double Glazing and Secondary Glazing solutions through our nationwide network of locally owned stores. Whether you're looking to improve comfort, reduce condensation, lower energy use, or create a quieter living environment, our experienced team can help you find the right glazing solution for your home.

To learn more, contact your local HomePlus store on 0800 466 375 or online.