Cooling and Overheating Feasibility Surveys

Prepare your buildings for rising temperatures to remain operational year-round.

Planning for the next heatwave starts today

Warmer summers are making overheating a growing challenge for organisations across the UK. Requests for air conditioning are increasing across schools, offices, care settings and manufacturing sites – but installing more cooling isn’t always the most cost-effective or sustainable solution.

In many cases, overheating has little to do with cooling capacity. Uncontrolled solar gain, heavy internal gains, weak ventilation opportunities, conflicting Building Management System (BMS) setpoints and inefficient plant operation can all drive temperatures up.

And when temperatures rise, productivity falls. Work performance declines by roughly 2% for every degree above 25°C, according to multiple workplace studies. It has consequences for continuity too. During the 2026 heatwave, more than 1,700 schools were forced to close or finish early, resulting in the loss of an estimated 15 million hours of learning.

Our Cooling and Overheating Feasibility Survey helps you understand the root causes of overheating before investing in cooling systems. We identify how much heat can be removed, then size and cost any cooling required for the remaining load. The result is a clear, evidence-based plan to reduce overheating risk, protect occupant comfort and productivity, and maintain business or educational continuity through future heatwaves.

  • Identify overheating risks before they affect operations

  • Keep occupants comfortable and productive

  • Prioritise investment based on risk and impact

  • Improve resilience against future heatwaves

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How we help

We conduct detailed on-site surveys to evaluate building performance, establish where heat comes from, how it accumulates and which spaces are most vulnerable.

Our evaluation will review:

  • Building fabric and thermal performance
  • Ventilation and air movement
  • Solar gain and shading
  • Occupancy patterns
  • Internal heat loads
  • Existing heating, ventilation and cooling systems
  • High-risk areas, such as classrooms, exam halls, IT suites, sports halls and offices

Using dynamic thermal modelling, we assess current and future overheating risks across your estate.

This allows us to

  • Identify areas currently at risk of overheating
  • Test performance against recognised standards
  • Assess future resilience using projected climate scenarios
  • Evaluate the effectiveness of potential interventions before investment
  • Calculate future cooling requirements where necessary

We create a phased investment plan with recommendations prioritised according to cost, impact and long-term resilience.

You’ll understand actions and investment opportunities to reduce overheating risk and strengthen business continuity.

Your board-ready report is designed to support estate planning and investment decisions, and support your wider climate adaptation strategy.

We’ll categorise recommendations into:

  • Short-term measures – Actions that can be implemented quickly to reduce overheating and improve occupant comfort.
  • Medium-term measures – Targeted improvements that enhance building performance and increase resilience.
  • Long-term measures – Strategic investments that support future estate plans and prepare buildings for a changing climate.

Our in-house mechanical, electrical engineering and Public Health (MEP) team can support the design, specification and delivery of the improvements identified within your report.

Whether you need ventilation upgrades, building controls optimisation, comfort cooling systems or wider building services projects, we’ll help turn recommendations into measurable outcomes.

From initial design through to installation, commissioning and maintenance, you’ll benefit from a single partner throughout the process.

Key features and benefits

Understand your exposure to overheating risks

Every building is different. Factors such as building design, orientation, occupancy levels, glazing and ventilation all influence how buildings respond to rising temperatures. We combine comprehensive on-site surveys with advanced thermal modelling to deliver recommendations tailored specifically to your estate.

Safeguard operations and academic outcomes

Excessive temperatures in buildings can impact concentration, attendance and performance. Taking action now can help minimise disruption during critical operational times, teaching and examination periods.

Support wellbeing

Reduce the likelihood of heat-related disruption and create comfortable working environments that help occupants stay focused, engaged and productive.

Build a long-term resilience strategy

We’ll deliver a prioritised roadmap that focuses investment where it delivers the greatest impact. A detailed report backed by robust evidence and modelling supports investment planning, funding applications, capital bids and estate strategies.

Don’t wait for the next heatwave.

Assess overheating risk across your estate, cut heat gains at source, and develop a practical plan to safeguard operations.

Get started
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New regulation is coming into force which means that every organisation’s electricity will need to be settled on a half-hourly basis. By October 2026 all electricity meters will need to be half-hourly. Don’t get left behind. If your meter is one of the circa 30 million affected by the regulation, it will need to be upgraded.

Find out more

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Find out more

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Prepare your buildings for rising temperatures to remain operational year-round.

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With in-depth knowledge of complex siteworks processes, we can oversee any size of project, from single supply to multiple services, liaising with distribution networks, suppliers, and meter operators. With a focus on communication, the team collaborates to ensure projects are delivered on time and customers are fully informed throughout.

Find out more

Mechanical and Electrical Condition Survey

Our condition surveys offer a strategic approach to managing building assets by assessing their condition and lifecycle costs.

Find out more

Our experience

Helping Brigshaw Learning Partnership save £18,000 on energy costs.

Helping Brigshaw Learning Partnership save £18,000 on energy costs.

How Broad Horizons Education Trust reclaimed energy bill overpayments.

Identifying hidden costs and reclaiming energy bill overpayments.

Simplifying Energy Procurement and Unlocking Savings for Holy Cross Catholic MAC

Simplifying energy procurement and unlocking savings for Holy Cross Catholic MAC.

Making utility management easy for North Essex Schools Partnership

Making utility management easy for North Essex Schools Partnership

Powering Penwortham Girls’ High School

Powering a lasting partnership with Penwortham Girls’ High School

Our decade of trusted utilities management with Radwinter Primary School

Our decade of trusted utilities management with Radwinter Primary School

Woodbridge High School: Protecting energy budgets in the London Borough of Redbridge.

How Woodbridge High School saved more than £12,000 on energy costs.

Leigh Academies Trust saves £500,000+ through flexible energy purchasing.

Discover how a 10+ year partnership helped one of the country’s largest and most established Multi-Academy Trusts navigate a turbulent energy market

Achieved savings: Year one
£
399,311
Forecast savings: Year two
£
200,287
Forecast savings: Year three
£
43,511

Helping a global commercial property insurer recover £63,356 in energy billing error

Discover how Zenergi’s client support team identified incorrect out-of-contract charges and spent more than a year resolving the issue.

Total refund
£63,356

Keeping energy costs under control for MK2 Real Estate

Discover how strategic procurement and ongoing oversight supports a growing property portfolio.

Mark Leonard

Strategic Client Partner

Zenergi

Uncovering potential energy savings of 26% for East Sussex County Council

Discover how we identified potential annual savings of more than £52,000 for a progressive Local Authority with ambitious net zero targets

Identified energy savings
1,042,371 kWh
Identified cost savings
£52,567
Identified carbon savings
194
tCO2e

Powering a historic dining hall for St John’s School.

Our Siteworks team streamlined a complex meter installation to meet ambitious timescales and ensure a new dining hall opened on time.

Karina Joshi

Strategic Customer Success Manager

St John's School Customer Success Manager

Bill Validation case study for independent school

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Billy Pryke

Strategic Customer Success Manager

Greener transport: helping Gregory Group meet ambitious goals.

A science-led partnership with one of the UK’s largest transport groups that led to impressive net zero acceleration.

Harry Eaves

Senior Energy Consultant

Zenergi

Discover how our energy audits highlighted £94,955 of annual savings for Aldermore Bank.

We’re helping Aldermore Bank to reduce carbon emissions and cut costs – all while keeping the bank’s net zero strategy firmly on track.

Total carbon saving
172.6
tCO2e
Total annual cost saving
£
94,955

Halving Glenmorangie’s energy costs through strategic building optimisation.

Discover how our partnership helped a whisky giant transform their facility’s energy efficiency with targeted solutions.

Estimated annual electricity consumption savings
59
%
Estimated annual gas consumption savings
52
%
Estimated annual overall energy savings
55
%
How we helped Danes Educational Trust unlock £166,000 for carbon reduction.

How we helped Danes Educational Trust secure £166,000 for carbon reduction.

Phase 2 LCSF grant awarded
£
39,000

A state-of-the-art, energy-efficient health centre for Henley Green.

Discover how our partnership transformed this Coventry practice into a model of healthcare sustainability and wellbeing-centred design.

Zahid Khalifa

Principal Electrical Design Engineer

Zenergi

ESG & Sustainability
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