Depends on yr existing aircon is inverter or non-inverter type.
If inverter type, open trunking and check condition of insulation and whether if copper pipe is of min grade G22 thickness.
If non-inverter, you need to change to brand new inverter aircon and all new copper and drainage piping replaced (Inverter gas need a higher pressure which non-inverter pipes cannot handle)(Non inverter system will be phased out and gas top up will be expensive)
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