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Energy Efficiency

Why is energy efficiency important?

Here at Everest we invest a lot in developing more and more energy efficient products to ensure they’re better for the environment and also better for you because they save you money.

Windows that achieve a basic A-rating make sure your home doesn’t lose any energy, because they only let out as much energy as they let in from the outside.

Everest Casement Windows are the most energy efficient in our range, with A-rated timber casement windows and B-rated aluminium casement windows.

But it doesn’t end there. Everest also makes windows that achieve the highest energy efficiency rating in the industry. Our Exclusives uPVC Casement Windows are an amazing A+21 rated for triple glazing and A+12 for double glazing. This means that they actually let in more heat than they let out, and they also carry the Energy Saving Trust Recommended Certification Mark. Everest uPVC Casement Windows also come with the option of triple glazing. 

This means you don’t need to use your heating as much to keep your home warm, saving you money on your energy bills.

It’s well worth you finding out how much you could save by changing to higher rated windows.


Why are windows given an energy efficiency rating?

Just like fridges and other electrical appliances, windows are rated on how energy efficient they are to help you see how different brands compare with each other. 

Unlike Everest, many companies actually don’t offer A+ or A-rated windows as standard, so it’s important to make sure you check the rating of what you’re buying.


What makes our windows so energy efficient?

We offer energy saving Everest Heatlok technology as standard in all our windows. Heatlok technology is coated low-emissivity glass which reflects heat back into your home.

This is combined with an Argon-filled gap between the panes of glass, to minimise heat loss. 

Our energy saving uPVC frames also feature draft resistant seals and a unique multi-chamber profile, and our aluminium frames have special thermal breaks, designed specifically to prevent heat transfer through the frame. Meanwhile, Everest Timber Casement windows are also A-rated as standard – made from a material with natural insulating properties.


WER Ratings


Explore our energy efficient range:

Windows Doors Conservatories