Maxim Air has installed and serviced air conditioning in the Hills Shire District for over 20 years.

Based in Castle Hill, our experienced technicians can design and install a custom cooling system for your home or commercial building that's tailored to your unique needs. We can also schedule air conditioning services and routine maintenance to keep your system operating at peak efficiency.

We also Provide air conditioning services, maintenance and repairs to North Shore Sydney and all across Sydney.

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Do I need air conditioning?

Air conditioning is essential for coping with Sydney's sweltering summers, which are getting hotter every year. The Hills District reaches a maximum temperature of 29.2°C in January and stays warm for most of the year.

Your air conditioner can even keep you warm in the cooler months of the year, when the temperature drops as low as 3.5°C in July. Reverse cycle air conditioning provides both heating and cooling from the same unit and is more efficient than installing and running a separate heater.

Air conditioning isn't only useful for maintaining comfortable temperatures indoors. These systems also reduce humidity levels, preventing damp and mould growth, and have filters to keep out pollen and other allergens to improve the indoor air quality. You'll also be able to close your windows and keep out irritating pests.

What type of air conditioner should I choose?

We install all types of cooling and heating systems across North West Sydney. When you book an obligation-free consultation with Maxim Air's air conditioning specialists, we'll inspect your property and listen to your needs and wants, so we can recommend the most suitable systems for you. These may include:

  • Ducted systems – discreet and efficient cooling for a whole building, with no bulky wall units and a single roof-mounted compressor. We also install ducted gas heating.
  • Split systems – compact indoor units connected to outdoor compressor units. We also offer multi-head split systems and VRF/VRV systems that only require a single outdoor unit.
  • Packaged air conditioners – all-in-one cooling and heating units ideal for single-floor commercial and industrial premises.
  • Mechanical ventilation – roof ventilators, ceiling fans, dehumidifiers, exhaust systems and air supplies to keep enclosed spaces cool and fresh.


We only deal with trusted brands and high-quality, energy-efficient products, so whatever system you choose, you can look forward to consistent cooling and lower energy bills. We install everything from individual units for rooms or small apartments to complex systems that can cool a whole building.

We can also discuss advanced features like individual zone controls, noiseless operation and AirCon Smart App Controller & Automation to help you get even more out of your air conditioning.

Why choose Maxim Air?

We have more than 20 years' experience installing and servicing all types of air conditioning in the Hills Shire District and wider Sydney. We always put the customer experience first and will recommend the best cooling solution for your needs, as well as instructing you in how to use and maintain the system for optimal performance.

Our technicians are fully licensed and insured, and we pride ourselves on not leaving any mess behind after installation. We'll arrange your free air conditioning consultation at a time that's good for you, so we can give you an honest quote with no obligation to continue.

Get your obligation free quote today

Get in touch with our air conditioning experts to book a free consultation in the Hills Shire District, North-Western Suburbs or other Sydney metropolitan areas.

Call us now or get in touch online.

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Rated 4.9
From 51 Reviews
  • Chan Michael Avatar

    Just had a ducted system and a single unit installed by Maxim. The "whole journey" was an exceptional experience! - very approachable, competitive and reasonable pricing, accommodating to installation date, friendly staff including the owners, who are down to earth people.

    No need to look elsewhere!

    Chan Michael 12/03/2019
  • Nasrin Azizi Avatar

    Amazing company. Well organised, great prices, even accept credit card payment. Could not recommend enough!

    Nasrin Azizi 01/03/2019
  • aida Nedel Avatar

    I would highly recommend MaXim Air to anyone looking for ducted system. We spent a lot of time and effort shopping around, when we could have gone to the best and most competitive to start with. very professional . A joy to deal with from the initial consult to the installation.

    aida Nedel 28/02/2019
  • Carolyn O’Brien Avatar

    MaXim Air recently installed ducted airconditioning in our home. From start to finish the service was very professional and efficient. The installations guys were awesome and worked tirelessly in extreme heat to complete the job and I couldn’t be happier with the result. Thank you MaXim Air

    Carolyn O’Brien 22/02/2019
  • Raj Bareja Avatar

    Thanks to Arran and Stephen for their excellent workmanship and customer friendly attitude. Right from the beginning of the process they always guided us about the right product for our home and kept us informed all along. We installed 18.0 KW ducted AC and the whole process was really smooth. There was some delay from my end in approving the quote but Arran still did his best to accommodate the installation dates so that my family can bear the unexpected hot weather in Sydney during the months of December and January. Thanks Maxim team.

    Raj Bareja 01/02/2019
  • Mark Pinder Avatar

    Very helpful and friendly, competitive prices. Installation team were customer focused and experienced... all arrived and finished on time. I would highly recommend. Installed a 12.5KW Daikin. Performs well.

    Mark Pinder 15/01/2019
  • Tom Williams Avatar

    The team at MaXim Air are extremely professional and friendly. They provided expert advice and suggestions during the initial quote for a ducted system, which was also highly competitive. The installation went flawlessly, they even helped fix up a sagging ceiling when installing the ducted vents. They truly went above and beyond in making sure I was 100% happy with the job. I would highly recommend MaXim Air Conditioning.

    Tom Williams 03/12/2018
  • Helen Devitt Avatar

    Arran provided expert advice and ideas (that no one else had suggested) for the initial quote for our ducted air conditioning. The quote was very competitive. We received reminders of the installation day via text prior to installation. On the day of installation Victor and his team arrived on the dot of 7am and worked all day until the job was completed. They were very conscientious and cleaned up thouroughly. Would highly recommend MaXim air conditioning services.

    Helen Devitt 01/12/2018
  • Calvin and Kimberley Avatar

    Maxim recently installed 2 split system air conditioners for us and we were very pleased with their excellent service. Stephen and his team were efficient, hardworking, professional, and pleasant to deal with. We were impressed with the effort that the team went to in ensuring we were happy with the position of the units in each room, and making sure the areas were tidy and all rubbish removed after installation. The team was punctual and completed the tasks within the quoted time frame. We also were grateful for the quick responses to our queries. We would highly recommend Maxim. Thank you Stephen and team.

    Calvin and Kimberley 18/11/2018
  • Andrew Wild Avatar

    Excellent service from the Maxim team. A bit late (due at 7am which is too early on a Saturday anyway!) but no concern as they did a great job and were very helpful. Highly recommended.

    Andrew Wild 17/11/2018

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