Hot water reheat coils are an important part of many HVAC systems. They are used to increase the temperature of air that has already been heated, providing a more comfortable environment for occupants. Hot water reheat coils are typically installed in air handlers, which are the components of HVAC systems that move air throughout a building. The coils are made of copper tubing that is connected to a hot water supply, usually from a boiler. When the air handler runs, the hot water flows through the coils, heating the air as it passes through. The heated air is then circulated throughout the building, providing a comfortable environment. Hot water reheat coils are an efficient way to heat air, as they require less energy than other heating methods. They are also relatively easy to install and maintain, making them a popular choice for many HVAC systems.