Welcome to Langler Air
Perth Home Air Specialist
New Air Conditioner in Perth

Top Considerations When Buying a New Air Conditioner in Perth

It’s the start of winter in Perth and we’ve already noticed the evenings and early mornings getting colder. As you pull out the jumpers and blankets, and embrace the cooler months ahead, let’s ensure your home is set up to provide warmth, comfort, and coziness throughout the winter season.

But it’s not just about staying warm – it’s also about maximising energy efficiency to lower electricity bills. Choosing an air conditioner with high energy star ratings can help you stay comfortable while minimising energy consumption and reducing costs.

In this blog, we’ll discover the top considerations when buying a new air conditioner in Perth.

Room Size

The first step when choosing a new air conditioner is to  measure the room size to determine the appropriate capacity needed for efficient cooling or heating. The size of the room directly impacts the cooling or heating efficiency of the air conditioner.

Begin by measuring the length, width, and ceiling height of the room to calculate the total volume. Larger rooms require air conditioners with higher capacity to effectively cool the space.

For small rooms up to 20m², you’d typically need an air conditioner with a capacity of 2-2.5kW. Medium-sized rooms ranging from 20-40m² would require a unit with 2.5-5kW capacity.

Larger rooms between 40-60m² would need air conditioners with 5-9kW capacity, while extra-large rooms over 60m² would require units with 6-10kW capacity for efficient cooling or heating.

Ensuring the right capacity based on your room size will help you achieve the desired comfort level.


Effective insulation in summer helps in maintaining the cool air inside while keeping the hot air outside, thereby easing the workload on the cooling unit. In winter, insulation minimises heat from escaping.

By having good insulation, you can potentially install a smaller and more cost-effective air conditioner that still effectively cools or warms your space. Insulation not only helps in keeping your home cool during hot Perth summers, and warm in winter but it also aids in energy efficiency, helping you lower your electricity bills.

Location and Climate

When choosing an air conditioner, it’s important to take into account the specific location of your property within Perth. Coastal areas might experience slightly milder temperatures due to sea breezes, while inland suburbs can endure more intense heat. Additionally, the orientation of your house can impact the amount of sunlight it receives, affecting the overall indoor temperature.

Understanding your local climate patterns can help determine the most suitable air conditioner for your needs.

Window Orientation

Do your rooms have west or north-facing windows? Do your roomsreceive direct sunlight? If the answer is yes, then you may require additional cooling to counteract the heat gain. These windows allow a large amount of sunlight to enter your home, leading to increased temperatures indoors. The direct sunlight can heat up the room quickly, making it harder for the air conditioner to maintain a comfortable temperature.

The best way to minimise heat from direct sunlight is to consider using shading options such as curtains or blinds to block out some of the sunlight and reduce the heat gain.

When choosing an air conditioner for rooms with west or north-facing windows, it’s important to choose a unit with sufficient cooling power to effectively cool the space. An undersized air conditioner may struggle to keep up with the heat gain from these windows, resulting in a less comfortable environment. By investing in a properly sized air conditioner, you can guarantee that your home remains cool and comfortable, even in rooms with significant window orientation challenges.

Energy Efficiency

Consider selecting air conditioner models with high energy star ratings to guarantee efficiency and cost savings in the long run. Energy-efficient air conditioners not only help reduce your electricity bills but also have a lower environmental impact. In Perth’s hot climate, where air conditioners often run for extended periods, choosing an energy-efficient model can make a significant difference.

Inverter air conditioners adjust their speed based on the cooling needs of your room, unlike non-inverter units that operate at a fixed speed. This flexibility allows inverter air conditioners to consume less power, making them more cost-effective over time.

When comparing different models, look for the Energy Efficiency Ratio (EER) and Seasonal Energy Efficiency Ratio (SEER) ratings. Higher EER and SEER ratings indicate better energy efficiency. Investing in an air conditioner with superior energy efficiency may require a slightly higher initial cost but can lead to long-term savings on your energy bills.


When choosing a new air conditioner for your home in Perth, make sure to prioritise features such as:

  • Multiple fan speeds: Adjust airflow for personalised comfort.
  • Sleep modes: Maintain a comfortable environment at night with energy efficiency.
  • Air filtration: Improve indoor air quality by capturing dust and allergens.
  • Smart controls: Monitor and adjust the air conditioner remotely for convenience and energy savings.

Prioritising these aspects won’t only enhance your comfort but also contribute to the overall efficiency and effectiveness of your air conditioning system.

Talk to the Experts at Langler Air

With over 30 years of experience in the industry, Langler Air, led by founder Mike Spear, has successfully installed more than 10,000 air conditioning systems in Perth.

As a Mitsubishi Electric Diamond Dealer, they guarantee that clients receive high-quality systems tailored to their requirements. Our team of professionals, who’ve been working together for over a decade, guarantee exceptional service from consultation to installation.

Whether you need a ducted system for a large space or a split system for precise climate control, we have the expertise to assist you. Worried about staying warm in winter? Our knowledge of reverse cycle air conditioners ensures you stay comfortable year-round.

Trust Langler Air to provide proven results and peace of mind for all your air conditioning needs. Contact us here.

Final Thoughts

When buying a new air conditioner for your Perth home, there are several factors to consider:

  • Room size, insulation, and location are crucial for determining the right size and type of air conditioner for your space.
  • Energy efficiency is important to help save on electricity bills and reduce your carbon footprint.
  • Features such as programmable thermostats and air purification systems can enhance your comfort and indoor air quality.

Investing time in research and selecting the appropriate air conditioner for your specific needs will ensure comfort and energy efficiency year-round.