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What Size Should Your Air Conditioning Unit Be? | The Heat Pump People   

The Heat Pump People • December 10, 2018

The Heat Pump People Explain the Aspects That Determine the Ideal Air Conditioning Size

Comparing different sized air conditioners

When choosing an air conditioning unit, it is important to take all factors into consideration. Choosing the correct size for your unit will ensure that it will perform at its peak efficiency.

Why is it Important?

It’s important to choose the right sized air conditioner to ensure that it is able to properly heat and cool your room. Air conditioners that are too big will end up using more energy than necessary. Air conditioners that are too small, however, will be unable to efficiently cool your room and will cause your system to overwork, shortening its lifespan.

Consider Room Size

The first aspect to consider is the size of your room, although there are many other factors to consider in conjunction with room size to ensure your solution is suited to your environment:


  • If your room is 20m2 or smaller, it is a small room and may require 2 – 4kw.
  • If your room is 20m2 to 40m2, it is a medium room and may require 4 – 6kw.
  • If your room is 40m2 or larger, it is a large room and may require 6 – 9kw.

Room Insulation

After considering room size, move on to room insulation. The stronger the insulation system within your room is, the better it will hold and maintain the ideal temperature.

If your room has poor insulation, a larger capacity air conditioning unit may be needed, as the room will leak and be less able to maintain the ideal temperature. You should also consider whether doors will be left open to heat the whole house or closed to heat a single room as well as occupancy numbers and how the room will be used.

Type of Air Conditioner

Once you have considered the size, insulation, occupancy and usage of your room, consider the type of air conditioner you want: split system (high wall, floor console or cassette), ducted or multi-system.

In most homes, the split system air conditioner is highly recommended for single use spaces. They offer the greatest cooling and heating abilities for your home and are often the most power and energy efficient models on the market.

Best Approach to Choosing

The best way to go about choosing a new air conditioner is to consult with professionals. They will be able to measure your room, taking into account your insulation and location and design a tailored solution. They may also be more aware of environmental context details that will be relevant to your selection, such as winter temperatures in your area and maintaining a suitable interior temperature with that considered.

They will also guide you through the different models and brands available, and the options that the different brands offer. If you require a brand that is more allergy-sensitive or dehumidifying or want a specific design or colour, they will take that into consideration.

Talk to The Heat Pump People

The Heat Pump People are passionate about providing the finest in heating and cooling technologies to our clients. If you have any questions about air-conditioners or about our services and how we can help you, feel free to contact us today. We are available on phone by 03 366 1823. Alternatively, you can reach us through our online contact form.

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