Buying the right capacity AC in Pakistan is the most important question that many online consumers have in mind these days. They all have a common concern and that is what tonnage A/C should they buy and whether it will be sufficient enough to keep their room cool. Generally, if one asks this question to a salesman, their utmost attempt would be to sell you the maximum ton AC, which in fact, will be more than required to cool the room.

Not only purchasing a higher capacity air conditioner is more expensive upfront, it can unnecessarily run up your energy bills during the summer, burning a hole in your pocket.

Buying a smaller capacity AC can be evenly worse as it will have to work harder to cool the space thus resulting in high electrical bills and leaving you empty handed at the end of the month.

The harsh reality is that when looking for a new air conditioner, people just simply head off to the market without knowing what size BTU unit will cool a certain area of their home. Oddly enough, it is common to see buyers raiding the home appliance shop frequently without any clue of what size they need.

Air conditioners come in various sizes, whether they be DC Inverter Units or Fixed speed type. A/Cs to be employed for a certain area require some calculations to be made so that you know that what’s best suited for what kind of a space. The question is how do you know?

To achieve optimum cooling with the most efficiency, you need to know some basics to get a pretty good idea of what size air conditioner serves best according to your needs.

In today’s post we’ll be acquainting you with all the information you’ll ever need to buy the perfect air conditioner for yourself.

So without further ado, let’s get started!

Does Size Really Matter?

As a matter of fact, yes it does. Pick too small a unit, you could end up with a room that's not cool enough, or with an air conditioning unit that overheats frequently- A Big No!

On the other hand, a larger unit for that specific space will not remove the necessary moisture from the room, making it feel uncomfortable for the user.

What’s a Ton?

Tonnage is the most important factor when selecting an air conditioner as it is directly related to amount of cooling it is going to deliver to a specific area.

Historically, the term “Ton” was originated by as a space that can be cooled using 1 ton of ice. So theoretically, a "ton" refers to the heat capacity of a ton of melting ice during a period of one day. This means that a 1 ton air conditioner can eliminate enough heat which can melt approximately 1 ton of ice in a day. So, the bigger the room, the more cooling capacity you’ll be needing.  

Does Ton by Any Means Refer to Weight of the A/C?

Understanding AC tonnage

Hell- No!

When we say that we necessitate a 1 ton or 1.5 ton air conditioner, it does not mean we are talking about its weight, so don’t freak out. As explained, a 'ton' refers to the amount of heat removed by the air conditioner in one hour. The metric for measuring this is British Thermal Unit or commonly BTU. Logically, higher the BTU, greater will be the cooling capacity, meaning the AC will be able to cool a larger area.

How Much Is A Ton Actually?


1 Ton => 12,000 BTU

1.5 Ton=> 18000 BTU

2 Ton => 24,000 BTU

3 Ton => 36,000 BTU

4 Ton => 48,000 BTU

Space Isn’t Just One Thing You Need to Consider

While space is one thing, there are other factor involved to calculate the right amount of air conditioner tonnage. Apart from just dimensions of a room, you also need to know the number of appliances in a room, number of windows, floor, insulation, facing direction, available power, fans available, humidity, wall type, city of use, furniture type, time it is to be used, orientation to the sun, number of people in room & outdoor conditions.

Frankly, there is no universal answer to this question but one can estimate the applicable amount of cooling required based on their situation, surroundings & requirements.

First Things First

The simple rule of thumb is to get all measurements. Using any measuring apparatus, you can get readings to calculate the size of the room to determine the BTU requirement of the AC accordingly.

Required Readings

  • Length (Ft.)
  • Breadth (Ft.)
  • Height (Ft.)

So what’s the Secret Formula to Find the Required Capacity?

What ac capacity should you buy

The answer to this is very simple.

First, find out the volume of your room by multiplying the length, breadth & height. For oddly-shaped spaces, reach back to basic principles you learned in geometry class. Once you have determined the entire area you plan to cool, you’re all set for AC shopping in Pakistan.

Do a little Math!

Length (feet) x Breadth (feet) x Height (feet) = Tada!

Let’s Do Some Table Talk

Now taking volume into consideration, find the right capacity A/C for yourself.


AC Ton Required

Up to 1000 cu ft.

1 Ton or 12,000 BTU


1001 cu ft.- 2250 cu ft.

1.5 Ton or 18000 BTU


2251 cu ft.- 3350 cu ft.

2 Ton or 24,000 BTU


3351 cu ft.-5350 cu ft.

4 Ton or 48,000 BTU


5351 cu ft +

HVAC or Additional Tons


For bigger spaces, simply add up the numbers to find the right tonnage A/C. The above volume to tonnage requirement table will help you determine the capacity you’ll be needing.

Suggestions for Better Decision Making

There are a few additional factors you need to keep in mind when buying the perfect capacity AC in Pakistan.

Add in 0.5 Ton extra if

  • You stay near places where summers usually cross 45 degrees.
  • You stay on the top floor of your building.
  • You don’t have proper insulation.

Summers are just around the corner and most places in Pakistan will encounter excruciating heat over the next few months. The only comfort to tackle the scorching summers would be none the less-an air conditioner.

Determining AC capacity is a critical move, so you need to be fully prepared before purchasing one.  Once the air conditioner is installed, it's a permanent fixture—so it’s better to get it right the first time. A properly sized A/C will always reward you with energy savings in the long run.

Stay safe and have delightful summers!!!

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Have a more complicated space or need more help regarding your air conditioner sizing needs?  Feel free to call us at 0300-0455570 or get in touch over mail at

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