What is the definition of a reheat coil? A reheat coil is an important component of a heating, ventilation, and air conditioning (HVAC) system, used to control the temperature of the air. It is a type of heating element that is usually located near the air outlet of an air handler. This coil typically consists of a series of coiled wires, each of which is connected to a power source. When the air is drawn through the coil, it is heated and then pushed back into the living space. Reheat coils offer an efficient and cost effective way to maintain comfortable temperatures in a home or building. Reheat coils are commonly used in commercial buildings, such as office buildings, to reduce the amount of energy needed to maintain comfortable temperatures. In addition, reheat coils can also be used in residential homes to ensure that the temperature is kept consistent and comfortable. They offer a reliable and cost effective way to keep your home or business comfortable all year long.