Size 6,000 BTU 10,000 BTU 10,000 BTU 12,000 BTU 9,000 BTU 10,000 BTU 14,000 BTU. Air Conditioner. Energy Saving - The air conditioner has a Combined Energy Efficiency Rate (CEER) of 11.0. Equipped with an Eco Mode to save energy and a Sleep Mode to ensure comfortable sleep conditions by adjusting the temperature throughout the night.