Below 1 and 1.5hp If ts is 27c guy get inverter, if ts is 21c guy non inverter will do ,Malaysia tiapx2 hari pun 40c feelling 21c room at night unachievable below 1.5hp especially evening sun blasting your wall and room if your room sunrise and dawn are terbalik

TS also can consider do it over configuration just get 2hp and above go for inverter definitely can reach your desire temp 21c and below as long your house with 3 phase electrical easily to distribute if you consider install more than 3 2hp and above

If monthly tnb bill already paying RM 700+ and above inverter or not inverter to me doesn't matter anymore just yolo.