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only 40 amps main switch per block based on link below. a standard 12k-btu split ac unit (blower inside, compressor outside) normally requires 13 amps. 3 will max out the 40-amp switch. a small window mounted ac unit requires at least 3.69 amps, and 9 of these will be more plausible.9 x 9000 BTU blower unit split into 2 x 33000 BTU condensers. It's not impossible, though he has to install another 40amp Main Aircon switch as HDB provides one only. Me no expert, just guessing...
https://services2.hdb.gov.sg/webapp/BN31AWERRCMobile/BN31SElectrical?loadAction=electrical