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January 8, 2026
If your commercial air conditioning system is over 12kW, UK law requires a TM44 energy assessment – commonly called a TM44 survey. These surveys are more than just a legal requirement; they are a practical tool for ensuring your system runs efficiently, safely, and cost-effectively.
What is a TM44 Survey?
A TM44 survey is a legal inspection of commercial air conditioning systems designed to:
- Assess energy efficiency
- Identify faults or inefficiencies in the system
- Ensure the system complies with UK building regulations
The survey results in a detailed report that includes recommendations to improve efficiency and reduce energy consumption.
Why TM44 Surveys Matter
- Legal Compliance: Failing to carry out a TM44 survey can result in fines or enforcement action
- Energy Efficiency: Systems that are poorly maintained or inefficient consume more electricity, increasing operational costs
- Equipment Life Span: Identifying issues early helps prevent unexpected breakdowns, extending the life of your system
- Environmental Responsibility: Optimising energy use reduces your carbon footprint, supporting sustainability goals
What Happens During a TM44 Survey?
Our Inergy Group certified engineers will:
- Examine the air conditioning system and components
- Review energy usage and efficiency
- Check that the system operates safely and effectively
- Produce a TM44 report with actionable recommendations
The report may highlight opportunities such as upgrading components, improving controls, or carrying out minor corrective maintenance to boost efficiency.
Who Needs a TM44 Survey?
Any commercial building with an air conditioning system over 12kW must have a TM44 survey. Systems include:
- Office buildings
- Retail outlets
- Schools and universities
- Hospitals and healthcare facilities
How Often Are TM44 Surveys Required?
The law requires a survey at least every five years for existing systems, and a report must be kept on-site. If changes, additions or upgrades are made to the system, a new survey may also be required.
Benefits of Acting Now
- Stay fully compliant with UK regulations
- Reduce energy bills and operational costs
- Extend the life of your air conditioning system
- Avoid fines and unexpected repair costs
Get ahead for 2026, there’s no better time to schedule your TM44 survey and ensure your air conditioning system is running safely, efficiently, and legally for the year ahead.
