The statement provided by the air conditioner shop is not entirely accurate. Inverter air conditioners are designed to provide efficient cooling by adjusting the compressor speed based on the cooling demand. Increasing the capacity of an inverter air conditioner one level above the required capacity is not a standard recommendation.
To determine the appropriate capacity of an air conditioner for a specific room, various factors need to be considered, including the size of the room, insulation, the number of occupants, and the amount of heat generated by appliances and sunlight. These factors help determine the cooling load required for the room.
Inverter air conditioners are known for their energy efficiency because they can modulate the compressor's speed and power consumption based on the cooling requirements. They can operate at a lower capacity when the cooling demand is low and increase the capacity as needed. This allows for more precise temperature control and reduced energy consumption compared to non-inverter models.
It's generally recommended to select an air conditioner with a capacity that matches the cooling load of the room. If the cooling load is determined to be 0.5pk (pico-kilowatts), then selecting a 0.5pk inverter air conditioner should be sufficient. Oversizing the air conditioner may lead to inefficient operation, as the unit will frequently cycle on and off, resulting in increased energy consumption and potential comfort issues.
To ensure you choose the right capacity for your specific needs, it's best to consult with a professional air conditioning technician who can assess your room's requirements and recommend the appropriate capacity and model of inverter air conditioner.