For businesses managing commercial buildings, air conditioning is an important part of maintaining a comfortable working environment. However, larger systems also come with energy efficiency and inspection requirements. A TM44 Air Conditioning Inspection helps building owners and managers understand how efficiently their systems are operating, where improvements may be possible and whether the building is meeting relevant regulatory requirements.

What Is a TM44 Air Conditioning Inspection?

A TM44 Air Conditioning Inspection is an energy efficiency assessment of an air conditioning system carried out by an accredited energy assessor. The inspection follows the methodology set out in CIBSE TM44 and is designed to provide practical information about the performance and operation of the system.

The purpose is not simply to check whether an air conditioning system is working. An inspection looks at factors such as system efficiency, controls, maintenance, sizing and opportunities for improvement.

The resulting report can help a building owner or facilities manager identify inefficient operation, unnecessary energy consumption and potential improvements that could reduce running costs.

Government guidance states that air conditioning systems with an effective rated output of more than 12kW must be inspected at intervals of no more than five years in England and Wales. This can include multiple smaller units where their combined effective rated output exceeds the threshold.

Who Needs a TM44 Inspection?

The requirement generally applies to the person who controls the operation of the air conditioning system. Depending on the property and arrangements in place, this could be a building owner, landlord, occupier or facilities manager.

One important point is that the 12kW threshold applies to the effective rated output of the system rather than necessarily the capacity of an individual indoor or outdoor unit.

For example, a commercial property could have several smaller air conditioning units, each below 12kW. If the units form part of a system under single control and their combined effective rated output exceeds 12kW, the system can still fall within the inspection requirements.

This is why businesses should not assume that an inspection is unnecessary simply because individual units appear relatively small.

How Often Is an Air Conditioning Inspection Required?

For systems within the scope of the regulations, inspections must take place at intervals of no more than five years.

If responsibility for a system changes and the previous inspection report is not provided to the new person responsible, specific requirements can apply. Government guidance also confirms that valid inspection reports need to be lodged on the Energy Performance of Buildings Register by the assessor.

Keeping track of the inspection date is therefore important for facilities teams and property managers. Waiting until an inspection becomes overdue can create unnecessary compliance issues and make it more difficult to plan maintenance and improvement work.

What Does a TM44 Inspection Include?

A TM44 assessment is intended to provide a broader view of the system than a routine maintenance visit.

The assessor examines the air conditioning installation and its controls and considers how effectively the system is operating in relation to the building and its cooling requirements.

The report can identify areas such as:

System efficiency

Condition and operation of equipment

Controls and operating settings

Whether the system appears appropriately sized

Opportunities to reduce energy consumption

Potential improvements to operation and maintenance

Possible replacement or upgrade opportunities

The government describes the purpose of these inspections as improving efficiency, reducing energy consumption and operating costs, and helping reduce carbon emissions.

This makes the report useful beyond regulatory compliance. It can provide building managers with practical information that can support future maintenance, refurbishment and energy efficiency decisions.

What Happens After the Inspection?

Once the inspection is completed, the assessor produces an Air Conditioning Inspection Report. The report contains information about the system and recommendations based on the findings.

Recommendations do not automatically mean that every suggested improvement must be carried out. Instead, they give the building owner or manager information that can be used to decide which measures are appropriate for the property.

Some recommendations may involve simple operational changes, while others could require further investigation, maintenance or investment.

For businesses facing rising energy costs, these recommendations can be particularly useful. Improving controls, reviewing operating schedules or addressing inefficient equipment may help reduce unnecessary energy consumption over time.

The government also states that inspection reports should include details such as the building address, assessor information, inspection date and the relevant accreditation scheme. Reports produced from 6 April 2012 must have a valid reference number generated through lodgement on the Energy Performance of Buildings Register.

How Much Does a TM44 Inspection Cost?

The cost of a TM44 inspection varies depending on the property and the complexity and size of the air conditioning system.

A small commercial property with a relatively straightforward installation may require less assessment time than a large office, retail premises, hotel or multi-zone commercial building with several systems.

The number of units, accessibility of equipment, system capacity, building layout and information available to the assessor can all influence the overall cost.

For this reason, businesses should obtain a quotation based on their specific system rather than relying on a standard price.

It is also worth looking beyond the inspection fee itself. A properly completed report can identify opportunities to improve system performance and reduce avoidable energy consumption, potentially providing value beyond the immediate compliance requirement.

What Are the Consequences of Missing an Inspection?

The air conditioning inspection requirement forms part of the Energy Performance of Buildings Regulations in England and Wales.

Government guidance states that failing to have a required system inspected can result in a penalty. GOV.UK currently states a £300 penalty for failing to have the required inspection carried out within the specified interval.

Businesses should therefore keep a record of their latest inspection report and make sure the next assessment is planned before the five-year period expires.

Choosing an Assessor

The inspection should be carried out by an accredited energy assessor who is qualified to undertake air conditioning inspections.

When selecting an assessor, businesses should consider their experience with commercial properties, understanding of TM44 methodology, accreditation and the level of detail provided in the final report.

A good inspection should be more than a paperwork exercise. The findings should be clear enough for a property owner or facilities manager to understand what is working well, where inefficiencies may exist and which improvements could be worth considering.

TM44 Inspect for Commercial Property Owners

For businesses looking to arrange a TM44 Air Conditioning Inspection, TM44 Inspect provides specialist air conditioning inspection services for commercial buildings across the UK.

The focus is on providing clear inspection reports and practical recommendations that help building owners, facilities managers and businesses understand their air conditioning systems and identify opportunities for improved efficiency.

Whether a business is arranging its first inspection, checking when its next inspection is due or reviewing an existing system, obtaining professional advice can make the process easier and help ensure the relevant requirements are understood.

Final Thoughts

A TM44 inspection should not be viewed simply as another regulatory task. For commercial property owners and facilities managers, it can provide useful insight into how an air conditioning system is performing and where improvements may be possible.

If a system has an effective rated output of more than 12kW, checking its inspection status should be part of responsible building management. With inspections required at intervals of no more than five years, keeping accurate records and planning ahead can help businesses remain compliant while also identifying opportunities to improve energy efficiency and control operating costs.

For commercial buildings, the most useful approach is to treat the inspection report as a practical tool for better building management rather than simply a document to keep on file.