Which of the following is not a major component of an air conditioning system?

• A. Condenser
• B. Evaporator
• C. Thermostat
• D. Compressor

Answer: (C)

The thermostat is not considered a major component of an air conditioning system. Instead, it functions as a control device that regulates the temperature by communicating with the system to maintain the desired environment. The major components of an air conditioning system that directly facilitate the cooling process include the condenser, evaporator, and compressor.

The condenser's role involves releasing heat from the refrigerant to the outside air after it has been compressed, while the evaporator absorbs heat from the indoor air, allowing the refrigerant to evaporate and cool the space. The compressor, on the other hand, is responsible for circulating the refrigerant through the system and increasing its pressure, allowing it to turn from a low-pressure gas to a high-pressure gas, which is essential for the cooling cycle. These components work together to effectively cool indoor spaces, whereas the thermostat simply provides a means to control their operation.