After carefully measuring the room, we determined that this particular AC would be plenty, if not, more than enough BTUs needed for our living room.  After installing, we found that the AC does not have a strong output to cool our living room.  We actually have to wait awhile to cool the room.  We had a previous 12,000BTU unit in our living room that gave us more than enough cooling and filled the room almost instantly.  We ordered the same 12,000BTU unit and it takes forever to cool the room.  I would not recommend this air conditioner unless you have a much smaller size room.