Thermal Performance

How Do Energy-Efficient Windows Work?

“Windows play a crucial role in your home’s warmth and energy efficiency. But how? Let’s start with U-values.”

“U-values measure how much heat is lost through a material. The lower the U-value, the better it is at keeping heat in.”

“Single glazing? It’s rubbish for insulation. There’s no gap to act as a barrier, so heat escapes quickly, leaving your home cold and inefficient.”

“Double glazing is a big step up. By adding a second pane and a 16mm gap filled with argon gas, it slows down heat transfer. The gas insulates better than air, and the gap keeps heat from travelling straight through.”

“Triple glazing improves insulation even more by adding a third pane of glass and two argon-filled gaps. These multiple barriers stop heat from escaping, reducing heat loss to a U-value of 0.5 W/m²K.”

“And vacuum glazing offers the ultimate insulation. The vacuum layer stops almost all heat transfer because there are no molecules to conduct heat. At just 8.3 millimetres thick, it achieves U-values as low as 0.4 W/m²K.”

“Here’s how they compare. Double glazing creates one insulating gap, triple glazing adds two, and vacuum glazing uses an ultra-slim vacuum layer to stop heat transfer entirely.”

“All our glass includes a low-emissivity, or Low-E, coating. This invisible layer reflects heat back into your home while letting in natural light, further improving thermal performance.”

“Choosing the right glazing can make a big difference—helping to reduce heat loss, lower energy bills, and create a greener, more comfortable home.”