What is Low-E Glass?

The ultimate guide to energy-efficient windows

If you’re looking for a way to improve your home’s energy efficiency, reduce UV exposure, and enhance indoor comfort, Low-E glass is the perfect solution. But what does Low-E glass mean, and is it worth the investment in New Zealand? In this guide, we’ll answer these questions and more, covering the benefits, disadvantages, and functionality of Low-Eg lass so you can make the best choice for your home.

What does Low-E glass mean?

The “E” in Low-E glass stands for low emissivity. This refers to a microscopic, transparent coating applied to the glass surface, designed to reflect heat while allowing natural light to passthrough. This special coating minimises heat transfer, keeping your home cooler in summer and warmer in winter without sacrificing visibility.

How does Low-E glass work?

Low-E glass works by controlling how heat and light interact with the window. The coating reflects infrared heat (which we feel as warmth) while still letting in visible light. This helps regulate indoor temperatures, reducing the need for excessive heating and cooling.
● In winter: It helps retain indoor heat, reducing heat loss.
● In summer: It reflects external heat, keeping your home cooler.

Low-E glass vs double glazing –
what’s the difference?

A common question we hear is whether to choose Low-E glass or double glazing. The truth is, you don’t have to choose –you can have both! Double glazed Low-E glass combines the insulation benefits of double glazing (two panes of glass with a spacer in between) with the heat-reflecting power of Low-E coating.

LOW-E GLASS VERSUS DOUBLE GLAZING:

Standard double glazing improves insulation, but when combined with Low-E glass, your home becomes even more energy-efficient.

IS LOW-E GLASS WORTH IT IN NZ?

Absolutely! With New Zealand’s varied climate, Low-E glass is a smart investment for maintaining indoor comfort and reducing energy bills.

WHAT ARE THE BENEFITS OF LOW-E GLASS?

01/ Energy efficiency – Lower heating and cooling costs year-round.

02/ UV protection – Blocks harmful UV rays, reducing furniture and flooring fading.

03/ Better insulation – Keeps warmth inside during winter and heat out in summer.

04/ Increased comfort – Reduces cold drafts and hot spots near windows.

05/ Sustainability – Helps lower your carbon footprint..

configuration diagram for options for awning and casement windows

Can you see through Low-E glass?

Yes! Low-E glass looks just like regular glass but performs far better. The coating is so thin that it’s virtually invisible to the naked eye.

Is Low-E glass better than clear glass?

Yes! Low-E glass out performs clear glass in nearly every way. While clear glass lets heat escape and allows UV rays to enter freely, Low-E glass reduces heat loss, blocks UV rays, and enhances energy efficiency.

Wondering how to tell if glass is Low-E?

Simply hold a flame or light up to the glass at an angle. If you see multiple reflections with one having a slightly different colour, that’s the Low-E coating in action.

WHAT ARE THE DISADVANTAGES OF LOW-E GLASS?

01/ Slightly higher upfront cost – More expensive than regular clear glass but pays off in energy savings.

02/ May slightly alter the tint –Depending on the type of Low-E coating, there might be a subtle tint, but it’s usually unnoticeable.

03/ Cleaning Low-E glass requires care – Use a mild, non-abrasive cleaner to avoid damaging the coating.

What is Low-E Glass?

Direct Fix Window Detail

Double Glazed Windows & Doors