Residential HVAC Installation Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

The reversing valve in a heat pump system plays a crucial role in switching the direction of refrigerant flow between heating and cooling modes. In heating mode, the valve changes the direction of the refrigerant, allowing the system to absorb heat from the outside air (or other heat sources) and transfer it indoors. Conversely, in cooling mode, the valve reverses the refrigerant flow, allowing the system to absorb heat from the indoor space and expel it outdoors, effectively cooling the indoor environment.

This functionality is essential for the operation of heat pumps, as they are designed to be versatile in both heating and cooling applications. By manipulating the refrigerant flow, the reversing valve enables the heat pump to efficiently provide climate control throughout the year, adapting to the homeowner's needs depending on seasonal changes. Understanding the reversing valve's function is fundamental to comprehending how heat pump systems operate and how they differ from traditional heating and cooling systems.