Whirlpool WHAT142-2BW 14,000 BTU 230V Through the Wall Air Conditioner - White Exceptional Cooling. Whirlpool, WHAT142-2BW. This powerful and efficient 14,000 BTU wall mounted ac unit is best for spaces up to 700 square feet with an attached, 4.8-ft plug that will fit any 230V/20A electrical outlet.