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How Much Is 12Kw

Electroninc Multi-meter

Only air conditioning systems with an effective rated output of more than 12kW are affected by these regulations. This will include systems consisting of individual units which are less than 12kW but whose combined effective rated output is more than 12kW.

The effective output of an individual air conditioning unit or system may be given on the rating plate attached to the unit. It may also be stated in the operating and maintenance manual or from the manufacturer’s website. Alternatively, where the system is covered by a maintenance contract, the capacity should be known by the contractor and should be reported in the maintenance records they supply.

The guidelines below are an approximate indication of typical figures for installed capacity for various spaces and may help you determine whether your system is within the scope of the regulations.

Activity Likely area requiring 12kW of cooling
Air conditioning general office spaces, assuming typical levels of electrical equipment and 8-10 m² per person 200 m²
Air conditioned offices with high levels of IT electrical equipment 100 m²
Retail spaces with average levels of display lighting 250 m²
Retail spaces with high levels of display lighting and illuminated cabinets 150 m²


Information has been taken from 'Improving the energy efficiency of our buildings - A guide to air conditioning inspections for buildings' leaflet from The Department for Communities and Local Government.
You can download a full copy of this leaflet here.

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