How does room size affect the BTU requirement of an air conditioner?

Room size is a critical factor in determining the BTU requirement of an air conditioner. A larger room requires a higher BTU air conditioner to cool it effectively, while a smaller room requires a lower BTU air conditioner. The BTU calculator takes into account the room size, along with other factors such as insulation, window size, and number of occupants, to provide an accurate BTU calculation.