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Choosing the best air conditioner depends on various factors such as room size, energy efficiency, noise level, brand, and budget. You should research and compare different models and brands to find the one that fits your needs and preferences.

Split air conditioners are generally considered the most efficient type of air conditioner among the ones you mentioned. This is because they are designed to cool specific rooms or zones, which helps to reduce energy waste compared to cooling an entire home or building with a ducted system. Additionally, split air conditioners often come with energy-saving features such as inverter technology and programmable thermostats, making them a cost-effective and energy-efficient choice for homeowners.

The running cost of a ducted or split system air conditioner depends on various factors, including the energy efficiency of the unit and the size of the area being cooled. However, in general, a split system is usually cheaper to run than a ducted system. This is because split systems are designed to cool specific rooms or zones, allowing you to use them only where and when needed, reducing overall energy consumption. On the other hand, ducted systems cool the entire home, which can lead to higher energy use and costs.

While split systems are typically cheaper to run, it's worth noting that the installation costs for ducted systems are often higher due to the complexity and scale of the installation process. Ultimately, the best choice will depend on your specific needs, home layout, and budget.

It is generally recommended that your home air conditioning system be serviced at least once a year. This annual maintenance helps ensure that the system is running efficiently and effectively and can also help prevent potential issues or breakdowns. Regular servicing includes cleaning the filters, checking the refrigerant levels, and inspecting the overall condition of the unit.

However, if you notice unusual sounds, odours, or performance issues with your air conditioning system, it is a good idea to have it checked by a professional as soon as possible, regardless of when the last service was performed. Prompt attention to any problems can prevent more significant issues and extend the life of your system.

Ideally, you should clean your aircon’s air filter annually. Annual cleaning helps maintain efficient airflow and improves the overall performance of your system. Keeping the filter clean not only enhances the air quality in your home but also extends the lifespan of your air conditioning unit by preventing dust and debris buildup that can lead to system malfunctions.