Cools Large Rooms: Efficiently cools down your room or office with Dreo 7,500 BTU variable-speed window air conditioner ... The 42dB quiet operation keeps your room peaceful as a library.

So, a 200-square-foot room needs at least a 4,000-BTU air conditioner. Those sensitive to noise should consider units with a quiet mode feature. Quieter units are more desirable for bedrooms ...