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Ask The Handyman in St. Louis

Why must air conditioners be vented, usually with a duct through a window? Refrigerators keep things cold with no vent to the outside.
Answer: Air conditioners must be vented out-doors to transfer the heat from one place to another. As a refrigerator cools its interior, it radiates heat into the room (usually from the back of the unit). That is why it is so important to keep the coils of the back of your refrigerator clean from dust and cobwebs. The unit will last a lot longer if properly cleaned and maintained. Air conditioners don’t really cool the air. They take the heat out of the air and displace it out through the vent.