House Windows - Energy Saving

Lower your energy bills with PLANITHERM – the most energy efficient glass available in the UK

It is a little known fact that a significant 26% of all domestic heat loss escapes through the windows in UK homes*. Installing energy efficient windows can save you up to 28% per year on your heating bills compared to traditional windows and frames.
Our own research has shown that many homeowners are unaware of the performance differences between different types of window glass, instead assuming that all double glazing is equally energy efficient. In reality, there are significant differences in performance with the type of glass used being key**

How does it work

PLANITHERM is a new generation of energy saving window glass that uses an advanced metallic coating that reflects heat from radiators or fires back into the room, rather than allowing it to escape through the windows. At the same time it allows free heat and light energy from the sun to pass through the glass, warming your home and further contributing to the energy efficiency of your windows. That means lower energy bills compared to standard windows.

Calculate your savings

We are confident that installing PLANITHERM will enable you to enjoy significant savings on your energy bills - as much as 28%.*

But you should not just take our word for it! We’ve teamed up with The Glass & Glazing Federation, the independent trade body for the glass industry, to bring you their energy savings calculator.
Find out how much you could save with our Energy Savings Calculator.


Using thermally insulating double glazing is the best way to improve the energy efficiency of your windows and make your home environment more comfortable.

  • Improved thermal insulation - reduced heat loss saves you money on your heating bills.
  • Promotes passive solar heat gain - free heat from the sun passes easily through the glass helping to warm the home.
  • Improved energy efficiency - reduced need for heating helps to save energy and protect the environment.
  • More comfortable rooms - improved thermal insulation means fewer cold spots and drafts near windows and doors.
  • Less condensation - the inner surface of the glass stays warmer, reducing internal condensation and prolonging the life of your windows.
To find out more about PLANITHERM glass visit our dedicated website  
Thermally insulating glass can be combined with many other products for multi-functional glazing, such as low-maintenance, solar control, noise reduction, decorative glass and enhanced safety and security.