Window Units

Explore Window AC Units

How it works? 

A window unit AC is a self-contained air conditioning system that is designed to fit into a window opening. The unit contains all necessary components, including the compressor, evaporator coil, condenser coil, air filter, and blower fan. When the AC is turned on, the compressor pumps refrigerant to the evaporator coil, where it absorbs heat from the room's air. The cooled air is then blown back into the room by the blower fan, while the heated refrigerant flows to the condenser coil, where it releases the absorbed heat to the outside air.

Who first invented this unit? 

The first window unit AC was invented in the 1930s by H.H. Schultz and J.Q. Sherman of the Westinghouse Electric Corporation.

Major producers and brands for this unit? 

Some major producers and brands of window unit ACs include LG, Frigidaire, GE, Haier, Friedrich, and Whirlpool.

Major preventive and corrective maintenance activities done on this unit 

Some major preventive and corrective maintenance activities for window unit ACs include cleaning or replacing the air filter, cleaning the evaporator and condenser coils, checking refrigerant levels, inspecting electrical connections, and lubricating moving parts.


The cost of a window unit AC can range from a few hundred dollars for a basic model to several thousand dollars for a high-end model with advanced features.

Capacities range 

Window unit ACs come in a wide range of capacities, typically measured in BTUs per hour. Capacities can range from around 5,000 BTUs for a small room to over 24,000 BTUs for a large room or open space.

Advantages and disadvantages 

Advantages of window unit ACs include their ease of installation, affordability, and ability to cool individual rooms or small spaces. Disadvantages include their noise level, the need for a window opening, and the limited cooling capacity compared to central air conditioning systems.

Where it is used mostly? 

Window unit ACs are commonly used in residential settings, particularly in apartments, dorm rooms, and smaller houses where central air conditioning may not be practical or cost-effective. They are also used in small commercial spaces, such as offices or retail stores, where individual temperature control is desired.

in MEP
Window Units
Administrator January 19, 2024
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Packaged Units
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