HVAC - EPA Certification Practice Exam 2025 - Free EPA Certification Practice Questions and Study Guide

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Which component in the HVAC system is often referred to as the heart of the system?

The evaporator

The compressor

The compressor is often referred to as the heart of the HVAC system because it plays a crucial role in the refrigeration cycle, which is essential for both heating and cooling functions. Its primary function is to compress the refrigerant, raising its pressure and temperature as it prepares to circulate through the system. This action facilitates the movement of refrigerant, allowing it to absorb heat from inside a space and release it outside or vice versa. Without the compressor effectively moving the refrigerant, the entire system would be unable to function, making it a vital component in maintaining the desired indoor climate.

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The condenser

The expansion valve

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