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[Guide] How to Calculate the Right AC Tonnage For Your Room

Are you looking to buy an Air Conditioner for your room? Today in this guide we will be discussing what is Cooling Capacity of an AC. How you can find the minimum cooling capacity in tons required for your room? And how to check the real tonnage AC, before or after buying it? So let’s get started.

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What is the Cooling Capacity of AC?

The cooling capacity of an AC is the heat load in the room, which needs to be removed in order to achieve a certain room temperature and humidity. The standard room temperature is defined as 24 degrees Celsius, and 55% Relative Humidity. Experts say that this combination of room temperature and Relative Humidity is most suitable for the human body.Cooling Capacity of AC

This heat load is measured in terms of BTU (British Thermal Units). It is the quantity of heat required to raise the temperature of one pound of liquid water by 1 degree Fahrenheit at the temperature at that water has its greatest density. It is measured in BTU/hr. The higher the BTU, the more the cooling capacity.

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Steps to Calculate AC Cooling Capacity Required For a Room

In order to find the minimum cooling capacity required to cool your room. You need to take care of multiple factors, like:

  • Your room is facing in which direction,
  • The number of electronic appliances, or gadgets in the room generating heat.
  • Size of Glass windows trapping the heat inside your room, etc.Check Average Cooling Capacity Of AC Required for Room

However, there’s a simple formula to get a basic idea of the cooling capacity required for your room.

1. Find the cubic volume of your room, in feet. To do so, measure the length, width, and height of your room, in feet, and multiply them.

Volume = Length x Width x Height (In feet)

2. Multiply the volume calculated in steps 1 by 6.

N1= Volume x 6

3. Take an estimate of the average number of people that will occupy the room. In case of normal official use, a person produces around 500 BTU/hr of heat. Multiply the average number of people with the heat produced.

N2= Avg. number of people x 500 BTU/hr

4. Add both N1 and N2, to get the average cooling capacity required for the room.

Average Cooling Capacity Required = N1 + N2 (BTU/hr)

5. Now, since the cooling capacity is in BTU/hr we need to convert it into Ton Capacity, to simplify our purchasing process. 1 Ton is equal to 12,000 BTU, however, you can go to this website to ease out the conversion process.

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How to Check the Real Ton Capacity of an Air Conditioner?

When purchasing an AC, it’s good to know its ton capacity. As it helps to get the right AC for your requirement. There are multiple ways to find out the ton capacity of your air conditioner:

1. The ton capacity of the AC is mentioned in the invoice or product listing.

2. If the Invoice does not have the capacity mentioned, or you have lost the invoice, then look for the model number of the AC. There you will find a two-digit even number, this number represents the BTU/hr, for example:

  • 12 = 12000 BTU (1 Ton)
  • 18 = 1.5 tons
  • 24 = 2 tons
  • 30 = 2.5 tons
  • 36 = 3 tons
  • 42 = 3.5 tons
  • 48 = 4 tons

3. If you can’t find the model number, look for the Star Rating Sticker on the AC. On the sticker, check the 100% cooling capacity of the AC, it should be mentioned in W (Watts). Now, go to this website to convert the cooling capacity from Watts to Ton.

Note: The real ton capacity of a 1 Ton AC is not exactly 1 Ton, but a little less. The same is the case with higher ton capacities like 1.5 Ton, 2 Ton, 3 Ton, etc.

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Wrapping Up

So this is how you can find the right AC tonnage required for your room, do note other factors like direct sunlight, glass windows size, and heat from electronic items do affect this capacity to some extent. Also, while buying an AC for your room, do check the Ton Capacity by any of the methods mentioned above. I hope you found this article useful. Stay tuned for more such tips and tricks.

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Gaurav Sharma

As an editor, Gaurav ensures the delivery of quality-rich, detailed, and accurate content tailored to the right audience. His three years of experience as a reviewer allow him to provide comprehensive evaluations of various consumer gadgets. On the video front, Gaurav serves as a video production manager for both long and short formats and anchors short videos at GadgetsToUse.