Is a 6000 BTU air conditioner good?

The best option for cooling a room that is less than 150 square feet is a 5,000 BTU air conditioner. Is that correct? If your room is between 150 to 250 square feet, a 6,000 BTU air conditioner will cool the room efficiently.An air conditioner of 5,000 BTU is the best option to cool a room of less than 150 sq m, while an air conditioner of 6,000 BTU is designed to cool a room of 150 to 250 sq m. If the size of the room is between 150 and 250 sq m, an air conditioner of 6,000 BTU will cool the room effectively.