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The condenser that creates the cool air that air conditioners pump out uses a considerable amount of power. A window must be wider than the air conditioning unit and also must open wider than the height of the air conditioner. In addition to room size, it’s also important to take into account the window size to ensure the air conditioning unit will fit. For example, a 12-foot by 20-foot room would require a 6,000 BTU air conditioner while a large 20-foot by 20-foot room would require an 10,000-BTU AC unit. Multiply the length times the width of the room and multiply that number by 25. Window air conditioners range from small models that produce 5,000 BTUs up to large units that can produce 18,000 BTUs or more.ĭetermining the right size window AC unit for a room involves making a simple calculation. An air conditioner’s cooling capacity is listed in BTUs-British Thermal Units. If it’s too large, the air conditioner will waste electricity and strain the motor with frequent short cycles. Choose a unit that’s too small and it will struggle to cool the space. Selecting the right size of AC unit for an area is vital when shopping for a window air-conditioner unit. While selecting the right size air conditioner to meet the room size is crucial, other factors are also vital to consider, including energy efficiency, noise level, and smart-home compatibility. Photo: What to Consider When Choosing the Best Window Air Conditioners BEST FOR LARGE ROOMS: TOSOT 12,000 BTU Window Air Conditioner.BEST FOR SMALL ROOMS: Friedrich Chill 6,000 BTU Window Air Conditioner.BEST QUIET: GE Profile 8,100 BTU Smart Window Room Air Conditioner.BEST SMART: LG 14,000 BTU 115V Air Conditioner with Wi-Fi Control.MOST ENERGY-EFFICIENT: LG 14,000 BTU Dual Inverter Window Air Conditioner.BEST-LOOKING: Frigidaire Energy Star Window Mount Air Conditioner.