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Does my air-conditioning system need a TM44 inspection?

Equipment and work · Question 1 of 3

What air-conditioning equipment is controlled as part of the building system?

Count the combined effective rated output of systems under the same control. Several smaller units can together exceed 12 kW.

Business or industry

What air-conditioning equipment is controlled as part of the building system?

Split or multi-split systemsWall, cassette, ducted or floor units connected to outdoor unitsVRF or VRV systemMulti-zone variable refrigerant flow equipment and controlsChiller or air-handling plantCentral cooling plant, chilled water and associated AHUsMixed comfort-cooling systemsSeveral equipment types serving offices, retail, hospitality or public premisesServer-room coolingDedicated comfort or close-control cooling serving IT spacesProcess or production coolingCooling connected to industrial or production activitySystems across several buildingsA portfolio or site with separate system boundariesNo air-conditioning systemVentilation or heating only, with no mechanical coolingEquipment scope is uncertainThe plant list, system boundary or cooling function is unclear

Choose an industry and at least one equipment or work type.

More help with TM44 inspections

Use these when you need more detail before appointing someone. This questionnaire is decision support, not a professional assessment or a legal determination.

Buying toolkit and quote checklist →Supplier evidence directory →

Guides, technical explanations and references

Duty and technical sources

In England and Wales, air-conditioning systems with a combined effective rated output above 12 kW must be inspected by an accredited energy assessor at intervals not exceeding five years.

GOV.UK TM44 inspection guide — Scope, 12 kW threshold, inspection cycle and responsibilities
GOV.UK inspection summary — Accredited assessor, report contents and enforcement information
Energy Performance of Buildings Regulations — The England and Wales regulatory framework

Published price evidence

AccuTemp — Publishes a fixed price from £450 plus VAT and a stated range of £450 to £1,800 plus VAT for most single-site work.
Robinsons Facilities Services — Publishes smaller split-system inspections from £300 plus VAT and larger or central-plant work typically from £400 to £1,000 plus VAT.
Heat Pump Installers London — Publishes TM44 inspections from £245 plus VAT for London and the Home Counties.

Inspection sequence

System boundaries turn units into one inspection duty

The assessor groups equipment under common control, verifies effective rated output and examines the energy performance of the complete air-conditioning system.

Check against GOV.UK inspection guide

01Plant inventoryIndoor units, outdoor units, chillers, AHUs and rated outputs
02Control boundaryThe person, building and units managed as one system
0312 kW thresholdCombined effective rated output, not only one unit rating
04InspectionAccessible plant, controls, sizing, records and operation
05Lodged reportFindings, recommendations, limitations and next due date

Evidence a competent appointment should leave visible

Plant and system schedule
Capacity and grouping rationale
Accredited assessor details
Lodged report and recommendations