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Home Solution Thermocill™ Window Board System
United Kingdom

Thermocill™ Window Board System

Sustainable building materials & equipment

Reducing energy demand, carbon emissions, and condensation in homes through innovative window board system

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Thermocill Limited

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Company Established Year

Since 2019

Who is this solution for

Govt, Business, Individual, NGO

Info

Available

To sell

Project Status

In commerce

Looking to expand internationally

Yes

Doing business in

worldwide

Awards

Energy Saving Trust Verified

2021

Independent certification confirming energy-saving performance.

Made in Britain Label

2021

Recognized for UK-based, sustainable manufacturing using recycled materials.

UK Patent Granted

2022

Patent awarded for Thermocill’s passive heat-saving technology.

Product description

Thermocill™ Window Board System is a groundbreaking passive solution that addresses the pressing need for energy efficiency and carbon reduction in residential buildings. By utilizing convective airflow, this innovative system effectively reduces heat loss, cold drafts, and condensation around windows, creating a more comfortable and sustainable indoor environment.

What sets Thermocill™ apart is its ability to harness warm air from radiators and direct it along the window glazing, forming a warm air curtain that significantly improves room heating efficiency. Independent studies have shown that Thermocill™ can accelerate room heating by up to 19% and deliver substantial energy savings ranging from 8% to 14%. This translates to a reduction of approximately 150 kg of CO₂ emissions per year in a typical three-bedroom home.

In addition to its energy-saving benefits, Thermocill™ also plays a crucial role in preventing condensation and mold formation, thereby enhancing indoor air quality and reducing health risks associated with damp environments. The system is constructed entirely from recycled nylon and packaged in recycled cardboard, aligning with sustainable practices and circular economy principles.

With its patent-protected modular design, Thermocill™ is versatile and adaptable for both new construction projects and retrofit applications, making it suitable for a wide range of residential properties, including listed buildings. Its ease of installation, maintenance, and operation without the need for a power supply or moving parts makes it a cost-effective and user-friendly solution for households and social housing initiatives seeking to enhance climate resilience.

Key characteristics and environmental benefits

  • Harnesses convective airflow to create a warm air curtain along window glazing
  • Speeds up room heating by up to 19% and reduces energy consumption by 8–14%
  • Prevents condensation and mold build-up, improving indoor air quality
  • Made from recycled nylon and packaged in recycled cardboard
  • Patent-protected modular design suitable for new construction and retrofit projects
  • Easy to install, cut, and maintain without power supply or moving parts
  • Ideal for social housing energy-efficiency programs and climate-resilient households

About the Company

Thermocill Limited is a UK-based clean-tech company founded in 2019 by entrepreneur Keith Rimmer, inventor of the Thermocill window board system. The company develops modular, patented window boards made from 100% recycled nylon. Thermocill systems redirect warm air from radiators upward against window glazing, significantly reducing heat loss, accelerating room heating, cutting CO₂ emissions, and minimizing condensation and mold. Independent testing by the University of Manchester and Salford Energy House, verified by the Energy Saving Trust, confirms energy savings of up to 8–14% and faster warming by 19%. Designed to be affordable and easy to install in both new builds and retrofit projects, it is particularly suited for social housing and homes using heat pumps. Thermocill is built to provide healthier indoor environments, reduce energy usage and carbon emissions, and support sustainable building practices across residential and institutional sectors.

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