1.) AC for living area 1.5hp normally not enough, but it depend how big the area, facing north or south, window, etc. If size of AC not enough cover the tempeture of the area, compresor will fully run, use more electricity.

2.) The AC better setting 23deg or below, cause the lower tempeture setting the cold can be maintain, if setting above 23deg the air will warm more easy then the compresor will fully running againt to keep the tempeture u setting it. This is bcos last time my AC has problemn after using 1 year+, the tecnical guy told me.