Aoa,
I wish to add, that all the air conditioners available in Pakistan are manufactured in China even those who claim to be of Malaysia or Thai origin.
Secondly, Inverter AC is cost effective when used continuously over longer period of time. Unfortunately load shedding is detrimental to the benefits of inverter AC.
Thirdly, it is crucial that the installation is done by a professional using vacuum pump. Purging is not an option as moisture is killer for air conditioner life and efficiency.