I am in marker for new airconditioner and am not sure about the size of air conditioner to buy. So, i googled and found that a room of size 150-200 sft, 6000BTU (0.5 ton) is enough. But the sales man recommended 1.5 ton for that size. when I gone through some threads, people are using 1.5 ton for this size of room. so, i am wondering what is the right size? is google right or wrong with calculations? anybody has any experiece with .5 ton in 150sqft room? one more thing, Samsung india website recommends 1.5 ton for 150-200 sft room. but Samsung USA website recommends 6000BTU for the same size room. so, are we misinformed or am I missing something here?