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EnergyPlus Windows

JSS's EnergyPlus range – unbeatable thermal efficiency

Our standard windows already offer high thermal efficiency – but our six-chambered EnergyPlus windows offer unparalleled results and enable cost efficient double glazing to be used, achieving similar U-values and energy ratings to more expensive triple glazed windows with other systems.

Designed to optimise thermal performance without the need for costly thermal inserts, EnergyPlus is an integral part of our windows.

Simulations show that EnergyPlus windows can achieve a window energy rating of A++ with ease. It can also achieve an ‘A’ rating with normal float glass on the outer pane rather than the more expensive low-iron glass required with other systems.

EnergyPlus is a superb range of windows, benefiting from being the most thermally efficient products of their type on the market.


Our top of the range EnergyPlus profile has additional chambers to prevent cold air from the outside transferring into your warm home.

The uniquely designed six-chambered EnergyPlus system not only prevents the transfer of cold air from outside to in, it also outperforms the highest energy performance standards currently in existence.

They break new ground with their innovative window system that’s more thermally efficient than other aging systems, one that helps fabricators achieve WERs without compromising security.

EnergyPlus windows have made a real impact in keeping energy usage and costs down, which means they are already environmentally friendly products, but add in the fact that the uPVC is entirely lead free in its composition, and that all other elements are designed to be easily recycled at the end of their lifetime, you can rest assured that when you choose EnergyPlus windows, you are choosing truly environmentally friendly products.

The six-chambered frames enable fabricators to manufacture energy rated windows without the need for costly thermal inserts and achieve an ‘A’ rated window using a lower specification sealed unit, mean considerable cost savings.

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just like to take this opportunity to say thankyou to everyone of you from the sales management and the fitters what a first class job, fitters very tidy didn't even know they'd been in my house. My windows look fantastic especially my sash windows, lost ...!

Mr & Mrs Weaver

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