Low-E Glass: What It Is and How It Works
If you have looked into replacement windows lately, you have probably seen "Low-E glass" mentioned everywhere. Short for low-emissivity glass, it is one of those technologies that sounds more complicated than it actually is.
Let us look at what it is, how it works, and whether it actually makes a difference for your home.What is Low-E glass
What Is Low-E Glass?
Low-E stands for Low Emissivity — a measure of how well a surface radiates energy. In plain language, it is glass with an ultra-thin, invisible coating that bounces heat back instead of letting it pass through.
Think of it as a thermos for your window. Keeps heat out in summer, keeps heat in during winter. And unlike a thermos, it still lets natural light through just fine.
The coating is made from multiple layers of silver and metallic oxides — so thin you cannot see them. There are two common types:
They are sometimes called "coated glass" or "reflective coated glass" in simple terms. The trade name is Low-E.
How Does Low-E Glass Work?
Heat moves through a window three ways: conduction, convection, and radiation. Low-E targets the radiation part.
The coating reflects infrared radiation from the sun before it enters your home. Less solar heat gain means your AC runs less.
The coating reflects interior heat back into the room instead of letting it escape through the glass. Less heat loss means your heating system works less.
The number that matters here is the Solar Heat Gain Coefficient (SHGC) — basically, how much solar heat gets through. Lower is better for hot climates.
Real Performance Data: What Tests Show
EEHE’s Low-E glass was tested by the Dubai Central Laboratory Department — an accredited facility — and the numbers are worth a look.
Test Setup
|
Parameter |
Result |
|
Glass Build-up |
6mm Low-E (812-029) + 12mm Air Space + 6mm Clear Glass |
|
Coating Position |
Face 2 (inner face of outer pane) |
|
Total Thickness |
24mm |
Key Results
|
Performance Metric |
Result |
What It Means |
|
Light Transmittance (Tv) |
41.72% |
Daylight comes in, heat gets blocked |
|
Total Solar Energy Transmittance (g) |
27.65% |
Only about a quarter of solar energy gets through |
|
Shading Coefficient (SC) |
0.32 |
Blocks roughly 68% of incoming solar heat |
A shading coefficient of 0.32 is solid performance. Nearly 70% of solar heat is blocked, while the glass still lets enough daylight through for a well-lit room.
Where Low-E Glass Is Used in Real Projects
This is not just a feature on a spec sheet. In a recent G+3 residential building, EEHE’s Low-E glass was used throughout:
The Ar stands for argon gas filling between the panes — it reduces heat conduction across the air gap.
The UV Side: Protecting Your Interiors
Low-E glass also blocks most UV radiation. That matters if you care about:
EEHE’s documentation describes the coating as similar to automotive window tinting in how it blocks UV while keeping visibility clear.
Low-E vs. Other Glass Types
|
Glass Type |
Best For |
Main Benefit |
|
Clear Tempered Glass |
Standard use |
Safety and strength |
|
Low-E Coated Glass |
Hot climates |
Blocks heat and UV |
|
Triple Glazing (3 panes) |
Cold climates |
Maximum insulation |
|
Laminated Glass |
Safety priority |
Holds together when broken |
|
Laminated Insulated Glass |
Safety + insulation |
Both benefits combined |
EEHE sources its raw glass from Xinyi Glass, China’s largest glass supplier, and does its own processing at two in-house fabrication plants.
Picking the Right Glass for Your Climate
Middle East, Southeast Asia, Southern US: Low-E glass makes a real difference here. It blocks outdoor heat and cuts cooling costs. EEHE exports to 60+ countries and tailors configurations to each climate zone.
Europe, North America, Northern China: Low-E can be combined with triple glazing. The coating keeps indoor heat from escaping in winter, and wide PA66 thermal barrier strips add another layer of insulation.
Is It Worth the Extra Cost?
For most homeowners, yes. Here is why:
In extreme climates — hot or cold — Low-E glass usually pays for itself in energy savings within a few years.
Why EEHE for Low-E Windows?
EEHE runs a 53,344 m² smart factory with automated production lines, laser cutting, and CNC machining. Glass is processed in-house at two dedicated plants. The company holds NFRC certification, CSA certification for North America, Intertek test reports, and over 300 patents.
Their Low-E glass windows have been used in projects ranging from single-family homes to the 68,600 m² Damac Lagoons development in Dubai.
Bottom Line
Low-E glass works. A thin coating on the glass reflects heat while letting light through — your home stays more comfortable year-round, and your energy bills go down. Pair it with a well-designed frame, argon gas filling, and proper installation, and you have a window that performs well in any climate.
Need help picking the right glass for your project? Contact EEHE’s team for advice based on your climate and requirements.
Sources: EEHE product documentation, Dubai Central Laboratory test reports (Report No. 826265 & 826267), EEHE technical specifications.