How to Choose the Perfect Size Air Conditioner for Your Home?

Author: Hunter Appliances and Mobility  Date Posted:21 May 2024 

An inappropriate size air conditioner can turn a hot day into an unbearable day, so you need to look for a model that is of the right size for your home. And if you are thinking that a high-capacity air conditioner will help, be prepared to pay hefty ...

Find out how AC size is measured

An inappropriate size air conditioner can turn a hot day into an unbearable day, so you need to look for a model that is of the right size for your home. And if you are thinking that a high-capacity air conditioner will help, be prepared to pay hefty bills. We have curated this article to help you pick the right air conditioner for your home. To understand how you can pick the appropriate size AC for your home, you first need to find out how AC size is measured.

How AC size is measured?

AC size is measured in kilowatts or kW, which is equal to 1000 watts. The higher the kilowatts, the higher the energy consumption. And higher energy consumption means high cooling capacity.

The kilowatts of an air conditioner help manufacturers, salespersons and consumers determine its cooling capacity. So, instead of going for the most expensive air conditioner, look for a powerful air conditioner. Also, find out how much cooling your room requires, as this will help you select the air conditioner that meets your requirements.

Some factors that should be considered for sizing the air conditioner:

Size of the Room:

A single air conditioner can’t cool your entire home, though it also depends upon the size of your house. Even if you are thinking of installing an air conditioner in every room, you still need to calculate your room size. So, before buying an air conditioner, measure the length, breadth and height of your room.

Home Insulation:

Another factor that plays a prominent role in selecting the size of an air conditioner is how well-insulated someone's home is. For example, a home that is well insulated does not require a high-capacity AC, as a low capacity works well in there.

Your Room Location:

If you want to install the air conditioner in the north or west direction, your AC is more likely to get direct sunlight during summer. This means you need an air conditioner with a high cooling capacity. However, if you want to save money, you can consider installing them in the south or east direction.

Placement of Air Conditioner:

The position where you are placing the air conditioner plays a vital role in deciding how much cooling capacity you need. For example, in a bedroom, AC should be installed in a location where the air does not flow directly over the bed. This is because direct air over the bed leads to a sore throat or dry eyes. The best is to place the AC well above the bed in a bedroom for both window and split types. 

Window Glazing:

You might know, but the window plays a vital role in heating a room. The good news is that you can improve your window performance by adding a layer of glass to your window, which is also known as window glazing. In this way, your air conditioner need not work hard to achieve the desired temperature and you can invest in a low-capacity one. But if your window thermal performance is low, look for an AC whose size is a bit up.


When picking the size of an AC unit, one of the most crucial factors to consider is the climate. This is because the climate across different states and territories of Australia varies. A thumb rule is to increase the size of the AC unit by a few kilowatts, if you live in an area where the temperature exceeds 35 degrees Celsius. 

Running Costs:

Your air conditioner will consume more energy if its cooling capacity is high. So, if you can’t afford hefty energy bills, look for a smaller air conditioner. But remember that small AC may need to work hard to keep the temperature of the room cooler, which can destroy your goal of reducing your energy bills. 

How to calculate the room size? 

Calculating room size will help you know how much capacity of air conditioner your room  requires.

1. In the first step, measure the length and breadth of the room and then multiply it to get the area in square meters. For example, if the length and breadth of your room is 10 meters, the area will be=10*10= 100 square meters.

2. In the next step, multiply the area that you have calculated with the specific numbers that depend on the height of your ceiling. For example, for a ceiling that is 2.4 metres high, the area should be multiplied by 150 watts, similarly for 2.7 metres, the area should be multiplied by 160 watts.

For example, for a ceiling height of 2.4 metres and an area of 100 square meters, the calculation should be done as:

100*150 watts= 15,000 watts

To convert this into kilowatts, divide this by 1000

15000 divided by 1000= 15 Kilowatts.

So, one needs a 15 kilowatt AC for an area of 100 square meters and 2.7 meters ceiling height.

Additionally, If you want to transform your home into a cool oasis with a high-capacity air conditioner, Consider buying a high-capacity air conditioner online in Hunter Valley and relish efficient, consistent cooling. Ideal for any room size, our AC units are the ultimate solution for summer heat.

Final Words:

So, these are some factors that you should take into account to pick the right size air conditioner for your home. Also, do the above calculations to ensure you pick the right size AC for your abode. If you can’t find the appropriate air conditioner, explore our products under the heating and cooling category and buy the perfect model.