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Properly Sizing your Commercial Air Conditioning System

Sizing your air conditioning system does not literal refer to the actual size in terms height or with but in terms of its cooling capacity. Ensuring that a commercial air conditioning system is appropriately sized goes a long way in providing a comfortable environment. This is because when a system has a small cooling capacity, it will be challenging for it to achieve optimal cooling capabilities in the commercial setting, which also causes a bit of strain to the system. On the other hand, too large of a system will see it turn on and off too many times since the optimal temperatures are reached a lot more often.

The Basics

An air conditioning system’s size is often rated in tons and they increase in levels of ½ tons and on average, a commercial air conditioner ranges from 2 tons to 30 tons depending on the magnitude of the building.

A 1-ton air conditioning system can remove approximately 12,000 British Thermal Units (Btu) of heat every hour. Therefore, calculating the commercial building’s cooling load will help in choosing the right sized air conditioner. The cooling load could be affected by such factors as amount of sunlight received, weatherisation or the design of the building.

Why Is Proper Sizing Necessary?

An accurately sized air conditioning system is just one of the sure-fire ways of achieving temperatures that are quite favourable in a commercial environment thus the system is generally run efficiently and smoothly.

Properly-Sizing-your-Commercial-Air-Conditioning-System

Possible Consequences Of Incorrectly Sizing Air Conditioning Units

The purpose of an air con system is create a sort of perfect balance in the temperatures in a building to keep it in proper ventilation and comfortable all year round. Therefore, when an industrial air conditioning system is not sized correctly, this balance will be destroyed thus there is a possibility of an air conditioning breakdown.

The installation of an oversized will likely turn on and off quickly in short bursts through the day. When this continues happening, the system will no longer have the ability to control humidity leading to poor air quality because of excess heating and mould growth too. This will can for air conditioning repair quite frequently than usual. Apart from causing a rise in the utility bills, the costs of repair and air conditioning maintenance will definitely rise.

On the other hand, if the air conditioning design is undersized, it will be forced to carry more load than it was designed to carry leading to break downs. Therefore, it is important to get air conditioning supply in the right size.

The Common Sizing Methods

The commonly used office air conditioning methods include:

  • Manual J: This method factors in the building materials, insulation and wall thickness among others. Requires knowing how these different aspects will affect heat transfer process.
  • Square feet: You get the right sizing by calculating the square footage of the building including the number of people, doors and windows inside it. However, it is not the best method because it ignores a number of critical variances.
  • Manual J and chart method: It is the most useful in large industrial buildings where the use of Manual J with the incorporation of duct sizing, comfort and psychometric charts are used to find the right size of the air con.

Accurate sizing of your industrial air conditioning will go a long way in saving you from a lot of headaches and issues in future. If you need any help in sizing, be sure to seek our professional help so that you don’t leave any room for mistakes.




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