Case studies

  • Share

Cavendish Engineers introduce a more efficient approach to building controls with Pressac’s CO2 sensors

Cavendish Engineers chose our sensor technology to control ventilation systems based on real-time air-quality data.


Cavendish Engineers are experts in the built environment. With over 20 years in the industry, they’re known for their innovative approach to designing and delivering retrofit solutions.

Their service allows clients to minimise energy consumption, improve performance and efficiency and create more comfortable spaces in which to live and work.

The challenge

Cavendish Engineers were commissioned by their client, a UK market leader in high-end commercial property, to improve the efficiency of workspaces across their London portfolio. The move was driven by their 2020 energy-reduction targets and Energy Savings Opportunity Scheme (ESOS) compliance.

An audit revealed the ventilation system was highly inefficient. It was running across their buildings, at full speed, throughout the working day, with energy being used to supply fresh air regardless of need.

Cavendish Engineers set about designing and developing an intelligent system using real-time workspace data to automate ventilation controls.

Blue-chip offices across London

The solution

After meeting Pressac at the Smart Building Show, Cavendish found an ideal solution in our CO2 sensors. The sensors use wireless technology and are solar powered, making them easy to install and incredibly low maintenance. They also offered a good level of accuracy (within 125ppm) while remaining cost effective.

By retrofitting a number of sensors on each floor of the building, they could get an accurate measurement of CO2 levels throughout the day, then control the air handling units based on demand.

Rather than running at full speed all day, units respond to increases in CO2 levels as occupancy increases. As well as preventing the building from wasting large amounts of energy, the technology also gives facility management teams full, 24/7 visibility of workspace conditions.

The results

The project delivered a 42% reduction in air handling, and has been shortlisted in the CIBSE Building Performance Awards 2018.

Cavendish Engineering have since developed and installed their intelligent system, now known as C-Tech, in offices of numerous blue-chip companies across London. They’ve also expanded the system to encompass our temperature sensors, which deliver intelligent heating and cooling driven by real-time demand.

Want to learn more?

Learn how our smart sensor technology could help your buildings and machines become smarter – get a demo


  • Get smart building insights

  • Partner with Pressac

    If you're looking for a forward-thinking technology partner who offers high-quality, cost-effective sensing solutions at scale - get in touch.
    Call us: +44 (0) 115 936 5200
    Contact us: Book a call