What is a TM44 Air Conditioning Inspection? A Complete Guide for Commercial Property Owners

If your commercial property is equipped with air conditioning systems that collectively exceed 12kW in output, you are legally required to have a TM44 air conditioning inspection carried out at regular intervals. Introduced as part of the UK’s commitment to improving energy efficiency under the Energy Performance of Buildings Regulations (EPB), these inspections are essential for ensuring compliance and reducing environmental impact.

But what exactly is a TM44 inspection, and why should commercial property owners take it seriously?

A TM44 inspection is a statutory assessment of a building’s air conditioning systems, designed to evaluate energy performance and provide recommendations for improving efficiency. The term “TM44” refers to guidance developed by CIBSE (Chartered Institution of Building Services Engineers) to support inspections as required by the EPB Regulations.

The inspection focuses on systems used for cooling, including split systems, VRV/VRF systems, and centralised plant systems. It must be performed by a qualified TM44 assessor.

You are required to undergo a TM44 inspection if:

• Your air conditioning system has a combined output greater than 12kW.

• You own or manage a commercial property.

• Your system has not been inspected in the last five years.

This applies to a broad range of commercial buildings such as offices, retail units, hotels, warehouses, and healthcare facilities.

Failure to comply can result in fines of up to £300 per unit and additional penalties for ongoing non-compliance. TM44 inspections are legally mandated under the Energy Performance of Buildings Regulations (EPBR).

Inspections identify areas where energy savings can be made, potentially reducing operational costs and carbon emissions.

Recommendations from the inspection can help prolong the life of your air conditioning units through proper maintenance and system adjustments.

Meeting TM44 requirements supports your corporate sustainability strategy and helps achieve environmental, social, and governance (ESG) targets.

• System Review

  • Age, size, and type of air conditioning units

  • Maintenance records and control systems

• Efficiency Assessment

  • Energy usage patterns

  • Operating schedules

• Site Visit

  • Visual inspection of indoor and outdoor units

  • Evaluation of filters, ducts, and energy management systems

• Report and Recommendations

  • Compliance status

  • Practical recommendations for improvement

  • Identification of non-compliance or inefficiencies

TM44 inspections must be carried out every five years. If your system is modified or replaced, a new inspection may be required.

Local authorities can issue fines for non-compliance. Additionally, businesses may face reputational damage or issues with lease agreements where compliance with building regulations is a contractual obligation.

• Gather maintenance records and equipment manuals

• Ensure access to all components of the system

• Rectify known issues in advance

• Reduced energy bills

• Improved indoor air quality

• Enhanced employee comfort and productivity

Ensure that your assessor is accredited and experienced with commercial systems. Look for memberships with bodies like CIBSE or accreditation schemes such as Quidos or Stroma.

• “We have regular HVAC servicing, so we’re covered.” No. TM44 inspections are distinct from routine maintenance.

• “It’s only for large buildings.” No. Any system exceeding 12kW qualifies, even if spread over smaller areas.

• “It’s a one-time thing.” No. Inspections are required every five years.

TM44 air conditioning inspections are not just a regulatory tick-box. They’re a strategic opportunity to improve the efficiency, sustainability, and legal compliance of your commercial property. If your system qualifies, booking an inspection now could save you money, avoid fines, and help future-proof your building.

Need a TM44 inspection? Contact our CIBSE certified assessors today for a free consultation and ensure your commercial property stays compliant and energy-efficient.