Some window air conditioners may be controlled with a handheld remote or by your phone. Controls range from simple knobs that you turn, to buttons that you push, to touch-activated electronic panels similar to those found on a microwave oven or washing machine. Window air conditioners are no different than other appliances in that their controls differ. For example, a 20-by-15-foot room would require a small 6,000-BTU air conditioner (20 x 15 x 20 = 6,000). Measure the square feet of the room’s floor (length times width) and multiply that by 20. In most cases, that means the a/c must have roughly 20 BTU of cooling per square foot of room space. Buy an appliance with appropriate cooling capacity relative to the room size. The same rule applies, a higher EER is better than a lower one.Ģ. Note that a few air conditioners still retain the older (but still valid) EER efficiency number. (Note, this is not SEER, or the seasonal energy efficiency ratio that applies to heat pumps and central air conditioning systems.) CEER expresses the ratio of cooling capacity measured in British Thermal Units (BTUs) relative to how much electricity the appliances uses to do its work it includes the appliance’s efficiency when the compressor is energized and running and when it’s not running, in standby mode. CEER is the efficiency rating that applies to window air conditioners.
Buy an a/c with the highest combined energy-efficiency ratio (CEER) possible. To ensure that you get the most cooling capacity for your money, you should do two things:ġ. You need to pay attention to those to select the best window air conditioner for your purposes. However, the appliance’s cooling capacity, features, and controls differ. The cooling process is identical among air conditioners. Or the fan on the back picks it up and throws it against the hot coil, where it’s converted back to moisture vapor and discharged with the hot air back to the outdoors. The water drips down to the back of the appliance and runs out through a drain. The moisture vapor in the indoor air condenses on the cold surface of the coil and becomes a liquid. In the summer, there’s a lot of moisture vapor suspended in the air, and in order for you to feel more comfortable, the air conditioner has to remove it. In exchange for the electricity to power the compressor and the fans, you get cool and dry air.Įqually important in the cooling process is dehumidification. Another motor-driven fan blows outdoor air over this hot liquid-filled coil and discharges the heat energy to the outdoors. The appliance’s compressor draws the heated gas to a coil on the back of the appliance, converting the gas to a liquid in the process. The heat energy in the room air passes through the metal coil into the cold refrigerant inside it. A window air conditioner works by using a motor-driven fan to pull hot and moist indoor air over a metal tube coil with cold refrigerant gas in it.
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