The Tech Behind Low-Energy Commercial Projects: HVAC

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It's estimated that commercial buildings contribute around 8% of the UK's total annual carbon emissions, and carbon associated with heating, ventilating, and cooling buildings makes up about 40% of a building's total annual energy usage.

In this first part of a three-part blog series, I am going to focus on several key HVAC (Heating, Ventilation, and Air Conditioning) technologies and controls that drive energy efficiency in commercial buildings. These technologies aim to optimise heating, cooling, and ventilation systems to reduce energy consumption and improve overall efficiency.

High-efficiency HVAC equipment

Utilising high-efficiency HVAC equipment, such as heat pumps, air conditioners, chillers and, dare I say, high-efficiency boilers, can significantly reduce energy consumption compared to older, less efficient models. These systems often incorporate advanced technologies like variable-speed compressors or modulating burners to match the load requirements more precisely.

Ductless HVAC systems

Ductless HVAC systems, such as variable refrigerant flow (VRF) systems, offer zoned heating and cooling capabilities, providing more control over individual spaces. By avoiding the energy losses associated with ductwork, ductless systems can improve energy efficiency and offer flexibility in building design.

Thermal storage systems

Thermal storage systems utilise off-peak or low-demand electricity to store thermal energy, typically in the form of chilled water or ice. This stored energy can be used during peak demand periods, reducing the load on cooling equipment during expensive or high-demand periods.

Energy recovery ventilation (ERV)

ERV systems recover and transfer heat or coolness from the exhaust air to precondition incoming fresh air. This helps to reduce the load on heating and cooling systems by using the energy from the exhaust air to condition the incoming air, improving overall energy efficiency.

Demand-controlled ventilation (DCV)

DCV systems adjust the amount of ventilation provided based on the actual occupancy of a space. By monitoring and adjusting ventilation rates based on real-time occupancy, DCV systems optimise energy consumption while maintaining indoor air quality.

Building automation systems (BAS)

BASs integrate and control various HVAC components, lighting systems, and other building systems. They provide centralised monitoring and control, optimising system performance, scheduling operations, and adjusting set points based on occupancy and load conditions, resulting in improved energy efficiency.

Variable frequency drives (VFDs)

VFDs are used to control the speed of motors, such as those in fans and pumps, to match the system's load requirements. By adjusting the motor speed based on demand, VFDs can significantly reduce energy consumption.

Advanced controls and sensors

Advanced control systems and sensors help optimise HVAC operations by monitoring and adjusting conditions based on real-time data. This includes occupancy sensors, temperature sensors, humidity sensors, and CO2 sensors that enable precise control and automation of HVAC systems, avoiding unnecessary energy consumption.

All modern and low-energy buildings use combinations of these technologies and control philosophies to drive down energy production and cleverly use and reuse valuable electricity and fuels to power them.

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Our Christmas Message

by Doug Johnson • 9 December 2025

As the year draws to a close, the Mesh team has been out in the community helping to spread some much-needed festive cheer. From fundraising in Santa suits, food donations for local families and donating warm clothing for those who need it most, the team has embraced the spirit of giving in the run-up to Christmas. Running for a Cause: The Guildford Santa Fun Run Despite the wet weather, members of the Mesh team braved the elements for the Guildford Santa Fun Run, raising money for the children’s charity, Challengers. Joined by Jacqueline Smith from our client TALO, Mesh’s Founder and Director Doug Johnson, along with Maria Fiore and Ilianna Filippopoulou, completed the festive run in full Santa attire. The team also reached their fundraising target, helping Challengers continue its exceptional work in supporting disabled children and young people in the community. Supporting Local Families in Need through the Lions Christmas Food Parcel Appeal For another year, Mesh proudly supported the Lions’ Christmas Food Parcel Appeal, helping to provide food parcels to individuals and families in need over the festive period. Thanks to the generosity of the Mesh team and many local businesses and residents, a huge selection of donated goods is now being sorted and delivered by the incredible volunteers at Lions Farnham. This annual initiative continues to be a meaningful way for us to support vulnerable members of our local community during what can be a really challenging time of year. The Coats for All Initiative Mesh has also taken part in the Coats for All initiative, a brilliant scheme that distributes warm, good-quality coats to anyone who needs one. Through the generosity of colleagues, friends, and partners who donated pre-loved coats in excellent condition, we are helping to ensure that more people can stay warm this winter. Many local libraries are acting as collection points, making this a simple but impactful way for people to support others in the colder months — and we are proud to play our part. According to Mesh Founder and Director, Doug Johnson: “Community sits at the heart of Mesh, and it’s been inspiring to see our team give their time, energy and generosity to support such worthwhile causes - not just this Christmas but throughout the year. Whether running through the rain, collecting food, or fundraising for local charities, everyone has contributed to making a real difference — and I couldn’t be prouder.” At Mesh, we believe that small acts of kindness create meaningful impact. A heartfelt thank you to everyone who donated, participated, or volunteered this year. We look forward to continuing our community support into 2026 and beyond."

Bringing Some Festive Cheer to Our Community This Christmas

9 December 2025

As the year draws to a close, the Mesh team has been out in the community helping to spread some much-needed festive cheer. From fundraising in Santa suits, food donations for local families and donating warm clothing for those who need it most, the team has embraced the spirit of giving in the run-up to Christmas. Running for a Cause: The Guildford Santa Fun Run Despite the wet weather, members of the Mesh team braved the elements for the Guildford Santa Fun Run, raising money for the children’s charity, Challengers. Joined by Jacqueline Smith from our client TALO, Mesh’s Founder and Director Doug Johnson, along with Maria Fiore and Ilianna Filippopoulou, completed the festive run in full Santa attire. The team also reached their fundraising target, helping Challengers continue its exceptional work in supporting disabled children and young people in the community. Supporting Local Families in Need through the Lions Christmas Food Parcel Appeal For another year, Mesh proudly supported the Lions’ Christmas Food Parcel Appeal, helping to provide food parcels to individuals and families in need over the festive period. Thanks to the generosity of the Mesh team and many local businesses and residents, a huge selection of donated goods is now being sorted and delivered by the incredible volunteers at Lions Farnham. This annual initiative continues to be a meaningful way for us to support vulnerable members of our local community during what can be a challenging time of year. The Coats for All Initiative Mesh has also taken part in the Coats for All initiative, a brilliant scheme that distributes warm, good-quality coats to anyone who needs one. Through the generosity of colleagues, friends, and partners who donated pre-loved coats in excellent condition, we are helping ensure that more people can stay warm this winter. Many local libraries are acting as collection points, making this a simple but impactful way for people to support others in the colder months — and we are proud to play our part. According to Mesh Founder and Director, Doug Johnson: “Community sits at the heart of Mesh, and it’s been inspiring to see our team give their time, energy and generosity to support such worthwhile causes - not just this Christmas but throughout the year. Whether running through the rain, collecting food, or fundraising for local charities, everyone has contributed to making a real difference — and I couldn’t be prouder.” At Mesh, we believe that small acts of kindness create meaningful impact. A heartfelt thank you to everyone who donated, participated, or volunteered this year. We look forward to continuing our community support into 2026 and beyond."

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Volunteering in the Surrey Hills

5 November 2025

Members of the Mesh team joined a local charity to help with a tree planting project on the Hampton Estate. This was organised by the Surrey Hills Society, an independent charity who do some great work to encourage people to spend time in the beautiful Surrey landscape. According to Mesh Director Doug Johnson: "We are always looking for volunteering ideas and this charity's work fits so well with our sustainability values. This was our second volunteering day this year. It is very much part of our ethos and culture to make a difference to our environment. These events are also a fantastic opportunity to bring our team together. Thank you to the Surrey Hills Society for a really good day in the autumn sunshine. It’s just so good for the soul!" Five members of the Mesh team joined the day – travelling from Worthing, Bristol and as far as Exeter to help out.