Aircon Calculator

Our aircon calculator is designed to make your cooling and heating decisions as simple as possible. Whether you’re fitting out a new home or upgrading your current system, calculating the correct air conditioning capacity is the first step to year-round comfort. This tool estimates the ideal kilowatt output required based on your room sizes and preferences, ensuring your system isn’t underpowered (which leads to inefficiency) or oversized (which wastes energy and money).

Behind the scenes, the calculator considers not only square meterage, but also factors like ceiling height, window size, insulation levels and how different areas of your home are used. These considerations help guide you toward a system that will perform efficiently without guesswork.

Choosing the right-sized system is more than just a numbers game, it directly affects your comfort, energy usage and system longevity. A unit that’s too small will struggle to maintain the desired temperature, while a unit that’s too large may cycle on and off frequently, wearing down components and increasing electricity bills. Our aircon calculator helps you strike the right balance by starting with one of the most crucial factors: room size.

As a general rule, for rooms with standard ceiling heights and insulation, you’ll need around 0.15–0.20 kW of cooling per square metre. Larger open-plan areas, western-facing rooms or poorly insulated spaces may require more. That’s why measuring carefully or using our aircon calculator to do the hard work is essential.

You may have noticed the question about individual temperature control. That relates to zoning, this feature allows you to heat or cool specific areas independently. Zoned systems are highly efficient for larger homes or offices, especially when usage varies between rooms. Our aircon calculator considers whether you’ve selected zoning and tailors the recommendations accordingly, helping you get the most accurate system size and layout.

If you answered yes to zoning, you may be recommended a ducted system with multi-zone capabilities, giving you more control and potentially lower operating costs. If you answered no, a simpler system like a split unit may be more suitable, depending on your floor plan.

Once you’ve entered your room dimensions and zoning preferences, our aircon calculator will provide a recommended capacity (in kilowatts) and system type. This serves as a starting point, our licensed technicians will then conduct a more detailed on-site assessment to confirm your requirements before installation. Factors like building materials, sun exposure and airflow patterns can influence final recommendations, which we fine-tune for maximum comfort and performance.