Abstract: Two-stage capacity Air conditioner can save more energy by improving SEER, through reducing compressor on/off frequency at low load conditions. By installing a 2-stage capacity compressor in an air conditioner unit, testing the performance and calculating the SEER according to the Indian climate temperature bin hours and ISO 16358-1-2013 standard, concluded that the SEER of the air conditioner unit as 2-stage capacity air conditioner can be improved approximately 15% higher than that of the unit as fixed single capacity air conditioner.

Key words: Fixed-speed compressor, Air-conditioner, 2-stage capacity, SEER