Glazing choices are an important option to consider. Glass can enhance the way your home looks and feels, but it also adds to the warmth and thermal efficiency of your home.

It’s a good idea to work through your options to find the right glass for your home. With options to reduce UV, minimise heat loss, and increase year-round comfort, your decisions can have a significant impact on the performance of your glazing.

Some factors to consider and discuss with your manufacturer are the orientation and shading of your home, the climate and noise around where you live. There are a variety of performance glass options to suit most requirements. Here is a quick overview of the most popular options to consider.

Double glazing

Double glazing offers year-round thermal advantages. Benefits include significant reduction in UV light and good retention of internal heat. As a bonus, it also dampens sound.


Low-E (the ‘e’ stands for emissivity) glass is a virtually invisible coating incorporated into your double glazing, improving the level of insulation in your home. The Low-E coating is applied to the inside surface of the exterior glass pane, protecting it from the elements. Look for products that are designed for New Zealand's conditions such as Solux-E by AGP which blocks excessive heat and also provides excellent light transfer and clarity for light, bright rooms.

Thermal spacers

A thermal spacer reduces heat transfer through the glass edge and improves the seal that is key to genuine double-glazing. A thermal spacer holds the two glass panes of your double- glazed windows and doors apart and creates a seal to hold in the gas fill. This keeps warm and cold areas separated, reducing heat loss around the outside of your glazing. The AGP System includes the ATS - Architectural Thermal Spacer for an airtight bond and ensures the best gas retention.

Gas fill

Inert gases such as argon and krypton can be used as an insulator in double glazing to create an additional barrier to heat loss and heat absorption, improving thermal performance. The efficiency of a gas fill is enhanced when paired with a thermal spacer.

What does Low-E do?

Retains heat

Low-E reflects the warm air in the home back into the house rather than escaping through the glass. This reduces the energy needed to keep the home warm in cooler months. Reduces heat loss by nearly 60% more than standard double glazing.*

*Based on 4mm Solux-E/16 ATS/4mm compared to 4mm/16mm Air/4mm

Blocks excessive heat

Low-E lets the sun's visible light pass through but reflects the 'sunheat' back out again. With less heat entering your home, there's less need for air-conditioning to keep it cool (blocks excessive heat) by 34% more than standard double glazing.*
*Based on 4mm Solux-E/16 ATS/4mm compared to 4mm/16mm Air/4mm

Filters UV light to reduce fading

Low-E helps protect furnishings in the home from fading by reducing the amount of UV light that enters through glass.

Learn more about high performance glass products

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AGP uses the best components and double-glazing technology available in New Zealand