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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. Our aircon size guide will give you an approximate guide to the air conditioner capacity required for a particular area.
An office with one person and an office of the same size with eight people is different. A person seated at an office desk gives off less heat than someone who is more active like in an office reception area or a restaurant filled with people eating and drinking. Add 400-600 BTU / person (average) depending on activity.
Here follows a guide only. For offices, homes and your average area requiring air conditioning always keeps the following factors in mind:
The power of an air conditioner is measured in BTU’s (British Thermal Units). To convert BTU’s into Kw: BTU x 0.0002928 = kW For Additional Heat Loads To BTU, The Following Calculation/s Could Be Used: People – Add 400-600 BTU / person (average) depending on activity Electrical Equipment ½ Wattage x 3.4 = BTU (e.g. a 100W light = 100 x 3.4 = 340 BTU)
Take into account excessive heat gain from large or multiple windows or a non-insulated roof.
An office with one person and an office of the same size with eight people is different. A person seated at an office desk gives off less heat than someone who is more active like in an office reception area or a restaurant filled with people eating and drinking. Add 400-600 BTU / person (average) depending on activity.
A room area or office space with blinds or glazed windows for direct sunlight protection, the heat gain is reduced.
If outside air is added to an area, this air will be warmer than the air in the given area and will need to pass through the refrigeration cycle to lower its temperature thereby causing the air conditioner to work at a greater load, thus the capacity is affected.
The heat load in an empty office in a building with no people in it might not be much compared to the heat generated by the equipment in a computer room. This extra generated heat will increase the heat load, affecting the capacity. An excessive number of lights will have a similar effect. Should the area being calculated be considered a standard heat load, then the following average heat load calculation could be used: 600 BTU / m².
A construction of bricks will generally be cooler than timber or metal.
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. Please use the table below to help calculate the size of your room by multiplying the length of your room by the width.
10 to 15 m² 9 000 BTU
16 to 20 m² 12000 BTU
21 to 30 m² 18000 BTU
31 to 40 m² 24000 BTU
41 to 50 m² 30000 BTU
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)
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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