Wall Air Conditioners: 5 Fast Facts

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Fact #1. The earliest seeds of what we now regard as air conditioning lead back to Ancient Egypt, where moistened reeds were hung in windows. As the cold water on these reeds evaporated, it served to cool the air that was entering each room. Fast forward to the late 19th century. Certain advances had led to people storing or harvesting large chunks of ice. They would then place these behind a fan, cooling the air that was blowing straight through.
Fact #2. The first modern air conditioner was invented by an American man in 1904. He based his invention on several early evaporation experiments that had been conducted by the likes of Benjamin Franklin. As these devices moved into mass production during the 1920s, the guiding principle continued to be that of using volatile liquids to cool the air as it passed through a series of coils or chambers.
Fact #3. AC works according to the same basic operating principle as refrigeration. This is apt, as you can imagine your home, or car, or office as representing a closed environment where cool air is being locked in. This keeps the temperature low.
Fact #4. Most units draw hot air in from the outside. That air is immediately filtered through a compressor, along with some form of refrigerant, like Freon. That air's temperature increases as it is filtered through the compressor. The heated and highly-pressurized vapor is then passed into a condenser. This cools the air by way of coils.
Fact #5. The most common issue with any AC unit is that it takes to blowing out hot air. There are two recurring reasons for this. The first is that a screen is clogged. In this case, all you need to do is remove the screen and hose it down. The second major cause of hot air is a lack of coolant. This is any easy fix, as well, although you'd be wise to consult an owner's manual.