Cool Your Premises

Calculate the Power your Air Con needs to be

There are many calculations a design engineer will undertake inorder to determine the correct air conditioning system for your building. A fundamental neccessity is that the cooling output of the air conditioner is greater than the heat gain of the space it intends to serve. Our cooling calculator will give you an approximate value for this heat gain (measured in BTU) and help identify the most appropriate cooling solution.

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Cooling calculator



How it works

The heat gain, also known as ‘heat load’, of a building or room is calculated by analysing the different ways in which it gains heat.…………………………………………………………………………………

These include not just the number of people occupying the space but also the extent of electrical items such as lighting, computers, photocopiers, machinery and plant. The biggest source of heat gain actually occurs via thermal ‘leakage’. As the sun radiates warmth through things like doors and windows or roof and walls, it heats the surfaces inside, creating what is in effect a big storage radiator.

Add up all these heat sources and you have the heat load of the building, expressed either in Kw (Kilowatts) or more commonly BTU (British Thermal Units).

Get started on your system

Our engineers have very sophisticated tools and computer modelling software to measure heat loads. They will take into account a number more factors than detailed above, for example shading to windows, location of premises and building construction and thermal properties. However for a quick, simple and approximate indication of what your heat load (and so cooling requirement) might be we have created a cooling calculator for your use. Please note that the calculator assumes a reasonable level of insulation to walls, roof or ceiling.  It is also only an approximate check of heat gain and does not replace the need for expert advise and detailed heat load calculation.