2ton ac

Hello Friends, I want to buy a AC for my Bed room. My room size is : 11(w) X 20(L) X 11(H). It is at the 1st floor and there is no 2nd floor above this room. I stay at Bhubaneswar, Orissa, india where the Temperature in summer is 40 Degree (+/-). Well as I am a working Person, I will use the ac...