Page last updated on 22nd April 2026
Save £23 a year by adding window film to your windows
With everyone thinking more about energy at the moment, we’ve put together some helpful tips to help save energy around the home. We teamed up with Nesta to show you that by adding window film to your windows you could save £23 a year. Find out how doing this could save you money.
What is window film?
Window film is a form of temporary secondary glazing. Not only can window film reduce draughts that can noticeably cool down your home, but it can also reduce heat loss through the glass of your window.
According to Nesta, Around 87% of homes could add window film to all windows in the property, leading to household savings of 3.2% a year (or £23 a year off a typical gas bill).
How to install window film
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Find the right window insulation for you
There are many different types of window insulation out there. Have a look online and make sure you get the right one that fits your window and your needs.
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Follow the instructions carefully
Most window films come with specific instructions. The better you follow those instructions, the more your film will insulate your home properly.
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Make sure your home is ventilated
Make sure that some of your windows are able to open in order to properly ventilate or freshen your home.
Is there help and advice for those worried about the rising costs of energy?
Yes, if you are worried about the rising cost of energy and being able to pay your energy bills, we have information on the support and help which may be available.
Find out more about the support available from the government including energy saving tips at the ‘Help for Households’ website.
Remember, by combining our smart energy tips you could save even more on your energy bills. Try reducing your boiler flow temperature or turning down your thermostat.
How much could I pay to run household appliances?
The appliance energy calculator below will show how the price cap change could affect the cost of using everyday household appliances. Simply update the drop-down buttons with your estimated usage to see the costs.
The energy calculator below will show how the price cap change could affect the cost of using everyday household appliances. Simply update the drop-down buttons with your estimated usage to see the costs.
The calculator below will show a cost estimate for the current price cap (April-June 2026), and compare that to the previous price cap (January-March 2026), and the price cap before that (October-December 2025). So, you can see how your energy bills might have changed over time.
Please note: The electricity used by domestic appliances can vary depending on make and model, so we’ve used average power ratings. We have also used the price cap figures for a standard variable rate, so this calculator doesn't take into consideration any fixed tariffs or additional costs.
This calculator was last updated on 01/04/2026.
How will the price cap increase affect my bills?
£39
Cost per month
Based on the current energy price cap
−£5
Compared to the previous price cap
(Jan-Mar 2026)
−£2
Compared to the price cap before the previous
(Oct-Dec 2025)
Our energy saving tips are courtesy of Nesta and Energy Saving Trust
It’s important that you use the energy you need to keep warm, safe and healthy at home. Please visit our trusted partners pages for more information on how to safely implement these tips within your home - Nesta and Energy Saving Trust.
Eligibility may vary. Consumer action required. Maximum savings based on a three-bedroom, semi-detached, combi boiler gas-heated home in Great Britain, paying 5.48p/kWh for gas and 22.36p/kWh for electricity and correct as of July 2024. Figures on smart meter display are for illustrative purposes only.