mini air conditioner

I dont have any idea

Small or big keep aside. What's the purpose of it? Where you want to use it? What is the room length and width? How many people going to be take rest with A.C? What is your budget allocation? In which company you have trust? Whether you want compact in size? or At what power you need it small? Make replay to all these we can give you an advise. Otherwise it is going to be same replies you get for your discussion.