Choices Energy Calculator

Are you looking to make your home more energy-efficient?

With Choices Windows, you can reduce the energy loss of your home by up to 40%. Use our energy calculator to help you understand how much energy you could save with our range of energy-efficient windows.

Leveraging modern technology to create a more sustainable world

At CWG We use the latest technology and techniques to ensure that our windows and doors are energy-efficient to help create a more sustainable living environment. We are committed to being an active player in the fight against climate change and our selection of energy-efficient windows and doors are the perfect solution for energy-conscious homeowners.

See what you can save

With our energy efficiency calculator, you can easily see how much energy and carbon Choices products will save you. Make an energy-efficient choice today and reduce your energy consumption with CWG.

* A British detached house has approx 25m2 glass area.

How do we calculate the energy savings in Yearly kWh?
We start by calculating your energy consumption in relation to your current windows and selected region. Using this equation:

(U-Value of current windows x Glass area of home) x Entire year's recorded degree days for selected region x (24/1000) = Current energy consumption

We calculate your energy consumption in relation to the selected CWG windows and selected region. Using this equation:

(U-Value of new CWG windows x Glass area of home) x Entire year's recorded degree days for selected region x (24/1000) = New energy consumption

To get the total savings, we calculate the difference between the new energy consumption and the old energy consumption, Using the following equation:

Current energy consumption - New energy consumption = Total energy savings*

*Please note, we are only calculating the difference in energy consumption between your current windows and CWG windows, the energy efficiency of your entire home is not required.

*How do we calculate the yearly CO2 Savings?
Because we know the energy savings, we can multiply the energy savings by the amount of C02 created per kWh. Using this equation:

Total energy savings x CO2 generated per kWh = Total CO2 savings

**How do we calculate Savings?

Financial Savings are calculated by multiplying the kWk Savings by £0.34 per kWh, as published by the Energy Price Guarantee From 1 October 2022.


Degree Days for selected UK region are for the year 2022 and based on a 15.5 Deg internal temperature. The Degree days data source can be viewed online

The function we used for calculating energy energy consumption can be found a

Data for average amount of CO2 created per kWh can be found here,kg%20per%20kWh%20of%20gas

CWG reserves the right for errors in weather data.

Choices Energy Savings Calculator

Do you want to know how much energy you can save by swapping to Choices Brand Windows?

With the ever increasing cost of fuel bills on everyone's minds, do yourself a favour and see how much energy you could save by swapping your tired old windows to our Energy Effcient 'Choices' brand windows. Not only will you likely save money but you will also be doing your bit to help the environment.

Why not consider our other collections from the 'Choices' brand




Choices Downloads

If you are looking for further information on the fabulous range of Aluminium Windows and Doors from the ‘Choices’ brand, consider downloading our Marketing brochures from our media centre.

Find a 'Choices' Installer

Choices Installers are experts in supplying 'Choices' Aluminium Double Glazing in and around your local area, selected especially to be part of the 'Choices' brand.

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