Ans: Just like any other type of air conditioner, cassette air conditioners also require frequency maintenance if you wish to keep the system in perfect shape and keep its performance at the optimal level. However, the frequency of maintenance may vary depending on various factors such as the manufacturer's recommendations, usage patterns, environmental conditions, and overall system condition. Therefore, it's important to follow the manufacturer's recommendations for maintenance and also consider the specific environmental conditions and usage patterns of your ceiling cassette AC when determining the appropriate maintenance frequency.