## '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 Hayley Windows we install CWG 'Choices' brand windows. CWG use the latest technology and techniques to ensure that their 'Choices' windows and doors are energy-efficient to help create a more sustainable living environment. Hayley Windows 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 Hayley Windows.

**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 'Choices' 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.

**Sources:**

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 https://www.enmanreg.org/freedd/uk-degree-day-data/

The function we used for calculating energy energy consumption can be found a https://www.open.edu/openlearn/nature-environment/energy-buildings/content-section-2.4.2

Data for average amount of CO2 created per kWh can be found here https://bulb.co.uk/carbon-tracker/#:~:text=With%20an%20average%20supplier%2C%20annual,kg%20per%20kWh%20of%20gas

Hayley Windows reserves the right for errors in weather data.