for this size 1.5ton will not be effective as inverter ac.
You need 2 ton wall mounted A.C.
Look at orient Ultron 2 ton on orient.com.pk.
Gree Kenwood Orient are all the same ACs but Orient has lesser complaint and really good people behind the company.
Gree has reached a different league now so its not affordable for most.
Orient has superb power consumption and cools the room very effectively and you can get it for very cheap. Quality is there in their units and if i had another choice i would've gotten orient instead of LG and Gree and kenwood that i have.
I do not own orient but have seen its performance and have been surprised comparing it to my acs.