Snap Air Conditioning Brisbane

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Aircon Supply & Install Specialists

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Air Conditioner Size Calculator / Guide

What size air conditioner do I need?

Here at Snap Air Conditioning, we want to help you in making an informed choice about the Air Conditioner size you need for a room.  

We have put together a Air Conditioner size guide to help you with your choice.  

Our Simple Air Conditioner Size Guide / Calculator​

Choosing the right air conditioner size for a given room size is very important if you want to minimize your electricity bill. Use our air conditioning size guide to search for the right kw rating size for your room area. A small air conditioner will have a hard time cooling a large room, or it might not be able to cool it at all. On the other hand, choosing a huge air conditioner could cool the room too fast, but will not dehumidify the room at all. This leaves the room cold and, at the same time, humid, which is not comfortable at all.

Another problem we have see is the air conditioner is so big that the thermostat does not have time to correct the temperature properly and leaves the room very cold. Therefore, it is crucial to decide what kw rating or sizing of aircon you need before buying one.
You can use a fancy Split system air conditioning sizing calculator but we have made it easy and strait forward with out sizing guide.
There are four main classes that affect how big your Air Conditioning needs to be, to effectively cool the area you wish to air conditioning.

A Class

Air Conditioning in a home with Insulated roof space, walls and sub floor, full brick or brick veneer construction, average size windows with awnings, full shading south facing aspect, temperate weather conditions.

B Class

Installing aircon in a home with insulated roof space, full brick or brick veneer construction, average size windows with internal shades, north facing aspect, temperate climate.

C Class

Cooling your home with Insulated roof space, full brick or brick veneer construction, average size windows with internal shades, east facing aspect or sub tropical climate.

D Class

Running AC with little or no insulation, weatherboard, fibro or brick veneer construction, large windows, no shading from the sun westerly facing aspect.


Split System Air Conditioner size calculator

Room size you are cooling

The first is obvious, the area of the room will effect the cooling capacity of your air conditioner.  This is calculated by length x breadth.  Say for a normal bedroom size 4m x 4m = 16sqm .   You would look at the table above and see that a 2.5kw unit will be sufficient most the time, unless you have a fibro, un insulated house, than you will need a 3.5kw as the 2.5kw will no cool to the desired temperature and will use a lot of power trying.

Air Conditioner size guide Australia
insulation to help with air conditioning sizing guide


Is your ceiling space in your home insulated and what kind of insulation is installed?  There are many different installations with many different ratings.  if your home was insulated during the insulation batts scheme, your roof space might as well not have insulation at all.  This was highly unregulated, and some people even found the rolls of foil insulation just thrown up in the roof not even installed.   You will have the double check that you have the proper insulation installed.  The rating for Brisbane is R4.1   in the ceiling and R2.8 within the wall.  You should get a professional to check and see what you have.


location also makes a big difference.  If you’re located on the Bay side and get a nice bay breeze every day,  your property is going to be a lot cooler.  If you are located inland somewhere like the North side of Ipswich where it generally is a lot hotter,  you will require a more powerful Air Conditioner to fight the extra heat load.  Have a look here at the temperature map of qld to help understand

qld temperature map
orientation affects sizing calculation of air conditioner size


The orientation of your room also affects the cooling capacity of the area. for instance, if you have a long living room with big glass sliding doors and windows along the northern face you are going to be getting a lot of that summer heat coming through with the sun shining most of the day on the northern walls and windows whereas if you had a southern facing living area, you would be much cooler as you are not getting any sun shining through the windows or on the walls generating heat

Our Clients Testimonials


Great company with great prices. Very upfront about costs and the cheapest I could find while still having great customer service and product.


Castro Thomas

Team members is a true professional who answered my questions quickly, came in at the best price and completed the job on time, Faultless!

Castro Thomas

Jacqueline Prior

Very friendly, professional and considerate. Would definitely use again.

Jacqueline Prior

A Farley

The price was very good, with no hidden costs. We had to wait two weeks for installation due to busy period but they showed up on time when they said they would. Finished efficiently and cleaned up after themselves. Very polite and easy to deal with.

A Farley

Kevin Mallett

Just had our living room air con unit replaced, through this company, really happy with the really prompt service and professional quality work. Thank you.

Kevin Mallett


Excellent company the staff pleasant and knowledgeable. Very pleased with the work done. Highly recommended.


Julia A

Great prices, quick installation and fantastic customer service

Julia A

Fabrice Turpin
Perfect installation, friendly and professional team!

Fabrice Turpin

Why Choose Snap Air Conditioning

Licensed & Insured Technicians

We are licensed through the Electrical Safety office / Arc tick and insured for up to $10m. Our technicians are employees with ongoing in-house training and not just subcontractors like other companies use. This ensures a professional service that remains focused on “YOU”- our clients.

100% Satisfaction Guaranteed

We always ensure that our clients are 100% satisfied with our services by taking heed of all the feedback we receive. If you are not overjoyed with our work, please let us know, and we will accommodate you until you are 100% satisfied & happy. Our 5-star reviews are proof of this.

5-Year Workmanship Warranty

We make sure that your newly installed air conditioning unit keeps running perfectly for the long-term. With our 5-year workmanship warranty, your products are ensured to work efficiently and NOT wasting power.

Wide Variety of Services

Our air conditioning services range from Split System installation, maintenance, repairs, replacement, multi head split and ducted. We have the best solutions for every air conditioning service you need.

Interest-free Finance

Get your dream air conditioning system installed in your home or business without paying the upfront price. You can choose any of our supply and install deals with 6 months interest free, with up to a 60-month finance option.

Wealth of Experience

We have been offering air conditioning installation services to our local community and Brisbane for over 15 years. We have seen it all, and we genuinely know what it takes to give the best benefits out of our industry experience.

Customer Support

We provide a dedicated customer support team to take care of your concerns quickly. We offer before, during, and after-sales support to secure complete customer satisfaction - every single time!

On-Time Services

Our air conditioning services are backed with efficiency and on-time delivery, not to waste your precious time. We also use the latest technology to ensure we get the job is done right and five times faster.

Honest, Affordable, Transparent Quotes

We Know affordability, honesty & transparency matters to “YOU” - our clients. We provide a free, full upfront quote and detail exactly where your money is going. No hidden extras or nasty surprises.

We Genuinely Care

We genuinely care about each one of our customers. If the system is not good enough to be used in our home or business, we will not recommend it to you. We aim to provide you with the best air conditioning system that you can enjoy for many years to come.

If you need cost-effective air conditioning for your home or business, call us on 📞 (07) 3084 3501 to get started. We have the most reliable & efficient solutions for you.

How can we help you today?

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