What Air Conditioner Size Do You Need?

For an air conditioner to effectively control and treat the heat load of the air in a given space, it is important to calculate the correct air conditioner size of the unit needed for that environment. It is better to have a qualified air conditioner installer do a precise on-site assessment as there are a number of different factors to consider. The following information will however give you an approximate guide to the air conditioner capacity required for a particular area.


15 to 18 m²


20 to 25 m²


30 to 35 m²


40 to 45 m²


55 to 60 m²

Size Of The Area

To determine the BTU size of the unit, the size of the area to be treated must be calculated:

Length of room x width = m²

If the height of the ceiling is over 3m, then add on the increased percentage of the area.


Air Conditioner Size Power Supply:

The following air conditioning units do not need a separate power supply and can be plugged into a wall socket:

Room size of up to 15m² = 9 000 BTU (2.6Kw)

Room size 18m² – 20m² = 12 000 BTU (3.5Kw)

Room size 24m² – 30m² = 18 000 BTU (5.3Kw)

Power Supply Unit required:

The Following Air Conditioning Units Need A Separate Power Supply To Be Installed To Which The Unit Must Be Connected Directly:

Room size 31m² – 40m² = 24 000 BTU (7.0Kw)

Room size 41m² – 50m² = 30 000 BTU (8.8Kw)

Room size 51m² – 60m² = 36 000 BTU (10.55Kw)


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