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Energy calculator

The Energy Savings Calculator provides estimated potential savings resulting from the replacement of older windows with more energy efficient windows.

Calculations are made by collecting a few details about your property, the type of windows you have and the main heating system within your property. To view the calculator, click the button below.

If you would like to add the Energy Calculator to your website, please fill in the form below to make your request.

    Accept I understand that Listers will not be held responsible for the use of the Energy Calculator and that the information provided is for estimation purposes only.

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