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Thermocill is an innovative device that has been three years in the making.


Independent researchers from the University of Manchester and the University of Salford have established that :


  • Thermocill reduces the amount of energy needed to heat up a room by up to 14%.

  • Rooms heat up 19% faster.

  • The estimated energy savings for a 3-bed semi-detached house is approximately 8% of the total heating or approximately a £93 saving per annum (data source UK Power).

  • The estimated CO2 emission savings in a 3 bedroom semi-detached house is about 150 kg.

  • The addition of a Thermocill unit to a window above a radiator can significantly reduce condensation at the bottom of the window.


All those findings were reviewed and verified by the Energy Saving Trust in 2021 and was subsequently given the 'verified' status.

Please download the technical reports by clicking on each one:

UoM report.PNG

Frequently Asked Questions (FAQs)

  • What are the health benefits of Thermocill™?

Damp and mould on or around windows, caused by condensation on the window pane, can cause health problems for those living in the household such as:

  • respiratory issues

  • allergies

  • asthma

  • and affect the immune system


The only way to prevent this is to clean up the damp and mould and stop it growing. 


The only way to stop it growing is to prevent the window condensation causing it.


The only effective solution to stop window condensation is Thermocill™.


Computer modelling carried out by Manchester CFD, confirms that the wall of warm air created next to a double-glazed window when Thermocill is installed, reduces the level of condensation produced. See our Scientific Evidence.

  • How and where can I install Thermocill™?   

 Thermocill™ is suitable for both newbuild and retrofit household projects.


Retrofit is an easy, straight-forward process and the device is particularly suited to social housing energy efficiency improvement schemes. 


The device can be installed directly on top of the existing window board, and once fitted can be covered using a 8-10 mm recycled capping board (hockey stick or angled type depending on the shape of the existing internal window board), and sealed ready for use.

  • How much does Thermocill cost?

Thermocill costs around £350 per box (price correct at the time of writing in Nov 2023) which contains 7.5 meters of product 50 modular units, enough for the average 3 bedroom house (based on four windows)

  • Where can I buy Thermocill from?

Details of the distribution channels will be announced on our website and social media channels by March 2023.

  • What tools do I need to install Thermocill?

A multitool is best to install Thermocill, this allows you to cut out the old window board neatly, a silicone gun to seal around the window on completion, a fine toothed saw to cut Thermocill or use the Multitool with a cutting blade plastic type materials. Thermocill is offering installation services from Autumn 2021 too in partnership with a national installer.

  • How difficult is it?

Any handyman can install Thermocill, it’s easy cut/click/seal watch the installation video.

  • Does Thermocill look all right?

You will only see the outlet vent which is adjacent the Window frame, if you crouch down and look up under the window board you may see the inlet vent yet only part of it, but it is very discreet.

  • What is Thermocill made of exactly?

Thermocill is made from 100% recycled Nylon, items such as umbrellas, clothing, carpet waste, rope, seat belts sleeping bags, all of these products and more are bad for landfill as they degrade very very slowly or not at all, they contain petrochemicals which harm our oceans, fish & sea life.

  • I am a renter. My owner doesn’t want to install Thermocill. How do I convince him/her?

That’s easy firstly by installing Thermocill it gives you the tenant a healthier living space, it alleviates harmful condensation & black mould from around the window and reveal stopping damage to the property, Thermocill saves energy, warms a room up much quicker & lowers the carbon emissions of the property, witch will conform with the coming government guidelines for landlords.

  • Can Thermocill be taken out easily and refitted somewhere else?

Yes the lifespan of the product is infinity, if you replace windows re-use Thermocill, if you want it in another window move it, 

  • Do I need to clean my Thermocill units regularly?

Only a quick clean of the outlet vent is recommended if it gets dusty, but Thermocill needs no maintenance it has no moving parts, no power supplies it’s a passive device. 

  • What kind of packaging do you use?

Thermocill comes in a 100% recycled cardboard box. Complete with a QR code for the use with our App.

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