A furnace is a device used to heat a home or other enclosed space. It is typically powered by natural gas, electricity, or oil, and works by burning fuel to create heat. The heat is then distributed throughout the home via a system of ducts and vents. Furnace supplies are the components that make up the furnace system, including the furnace itself, the ducts, the vents, and any other necessary components. Furnace supplies are important for ensuring that the furnace system works properly and efficiently. They are also important for maintaining the safety of the system, as some components, such as the furnace, can be dangerous if not properly maintained. Furnace supplies are typically purchased from a heating and cooling supplier, and can include anything from the furnace itself to the ducts, vents, and other components.