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TM44 Air Conditioning
The Regulations, Survey, What it Means for You and Glossary

The Reasons

TM44 Inspections are the regular inspections and reports for air conditioning units, as required by the Energy Performance of Buildings Directive.

The reports can highlight any obvious flaws in the operation and/or maintenance of air conditioning units as well as listing opportunities to increase the efficiency of the unit (and therefore decrease running costs).

The Regulations

The Energy Performance of Buildings Directive (EPBD) requires states to have measures that establish regular inspection of air conditioning systems with an effective rated output of 12kW or more. This includes multiple smaller systems that add up to an effective rated output of 12kW or more.

TM44 is the guidance on correctly carrying out a comprehensive enough inspection of air conditioning units to satisfy the EPBD regulations.

Buildings with A/C units meeting the 12kW threshold are required to have a TM44 inspection carried out at least every 5 years, by a suitably qualified assessor.

The Inspection and Report

The Inspection

The TM44 inspection itself involves an in depth onsite survey by a TM44 qualified assessor, during which the assessor must:

  • Create an asset list of all VRVs, splits and AHUs (this is only necessary if there isn’t one already, and it may incur an extra cost).
  • Sample the cooling plant.
  • Photograph the cooling plant and data plates.
  • Sample the inside cassette or fan coil and controller.
  • Photograph the inside cassette or fan coil, controller and data plates.
  • If AHUs are present that are part of a cooling system these are also sampled and photographed.
  • Locate F-gas and maintenance documentation.
  • If plans are available the assessor will link the systems to the relevant rooms on the plan, or if there isn’t one available one will be made before linking the rooms and systems.

The Report

After the site visit the data collected during the site visit is processed and compiled into a detailed document including information such as

  • Key Findings - building performance, average system energy rating, etc.
  • Executive Summary - purpose of the survey, building information, business hours, maintenance, etc.
  • Tables and Calculations - asset register, equipment, comparisons, energy usage, ACE WIZARD energy calculations, etc.
  • Site photographs.

The report focuses on the suitability of the air conditioning unit for the building and purpose, as well as ways that the unit can be improved to lower carbon emissions, energy bills, etc.

To be valid the report must be lodged on the Energy Certificate Register, and it will expire after 5 years.

What it Means for You

Building Owners and Managers

If you are a building owner or manager in charge of any air conditioning units with an effective rated output of 12kW+ (including a number of smaller units that total to 12kW+) then you are legally required to have a TM44 Inspection carried out every 5 years.

You can be fined up to £300 per unit if you fail to keep a TM44 inspection report lodged on the Energy Certificate Register or provide one to an enforcement office within 7 days when asked. These fines can be re-issued on a daily, monthly, quarterly or annual basis.

Those with air conditioning units with an effective rated output less than 12kW, while not legally required to have TM44 inspections carried out, may benefit from commissioning one as the report will provide scope for increases in efficiency and point out any obvious flaws in operation and maintenance.


TM44 - The standard for correctly carrying out a comprehensive inspection of A/C units to satisfy the EPBD regulations.

VRV - A Variable Refrigerant Volume air conditioner that you can run multiple A/C units from.

Splits - A single air conditioner.

AHU - Air Handling Unit.

ACE WIZARD- Specialist software used to process the TM44 report.

Cooling Plant- Anything that generates cooling.

Asset List- A list of all types of HVAC in the property.

HVAC- Heating, Ventilation, and Air Conditioning.

A/C - Air Conditioning.

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