It depends on which part of the country you are living in. Like if you are living in the northern part of India, then you don't need to service for more than a year, and if you are living in southern India. Then, the air conditioner needs to be serviced every 6 months. The condition is the same like if you run an air conditioner for 12 months then you need to service every 6 months for better performance. Otherwise, one time is sufficient for everyone.