Energy Saving


South Lakes Windows Ltd acknowledge our responsibility to the planet’s environment and believe that energy ratings are essential in helping you to make an informed decision when purchasing new double glazed windows and UPVC doors.

Window heat loss can account for up to 30% of the total heat loss from your home!



The Ultimate Collection products from South Lakes Windows Ltd were tested for their energy efficiency using a variety of glass sealed unit configurations. The tests concluded that The Ultimate Collection Bevelled and Ovolo systems achieved similar results and were awarded “C”, “B” and “A” ratings with an Energy index far higher than many of its competitors, surpassing the standards of all current building regulation requirements. Help care for our Planet – Windows with ‘A’ rated glazing!


The Genuine article


All The Ultimate Collection PVC-u windows and sealed units are manufactured to the highest specifications, this guarantees that the standard for the energy rating you have requested has been met.


The two panes of glass sandwich an inert argon gas that prevents heat transfer. Also all glass seals are modified to stop heat transfer as well as energy efficient features in the frames themselves. The glass itself is also engineered to minimise heat loss.



Double glazed windows manufacturers supply the British Fenestration Rating Council with accurate drawings of the window sections along with details of the type of glass sealed units used.


Computerised simulation tests are then carried out that will assess:

  1. Solar Heat Gain.
  2. Thermal Losses.
  3. Air Losses


Based on these results all PVC-u double glazing is then certified from an “A” Rating to “G” Rating (“A” being the best possible energy saving performance window).



Modern glass technology offers a range of glass types that together with warm edged spacer bars and argon gas cavity infill, help achieve lower U-values and provide far more energy efficient upvc double glazed windows and doors.


Therefore replacement windows are now energy rated which will keep your heating bills down and help reduce harmful CO2 emissions! Help the Planet – South Lakes Windows Ltd

Why you should consider the importance of Energy Saving Windows

You may think a window is a window, no need to complicate matters and the reasons for having windows in your house are simple…

  1. Daylight intake
  2. Visual contact with the outside world
  3. Rapid ventilation
  4. Escape in the event of fire


All of the above are true however since the publication of the Governments Building Regulations Part “L” (2006) it is a legal requirement to ensure the windows fitted in your house help to conserve fuel and power and cut down on CO2 emissions. This is achieved by fitting double glazed Energy Saving Tricept Windows.


With carbon emissions high on the global agenda and the cost of fuel rising, we are looking for ways to make our homes more energy efficient.


Numerous household items are now manufactured and installed to these energy requirements and clearly fitting the correct windows is one of the most essential energy saving choices you will make for your home.



Up to 800 times more thermally efficient than conventional metal reinforcements…


Reinforcing has traditionally been fitted into PVC-u double glazed windows for 2 reasons. Firstly to offer a better fixing for various hardware fittings and secondly to ensure the rigidity of the frame in the direction of high winds.


The graphs below clearly show how the new Ultimate Collection PVC-u thermal inserts more than out perform BS requirements, but also add a completely new advantage in the manufacture of Energy Efficient windows.

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