Heating units are devices designed to increase the temperature of a space, making it comfortable during cold weather. They can be powered by various energy sources, including electricity, natural gas, or oil. Common types of heating units include furnaces, boilers, and heat pumps, each serving different heating needs and efficiency levels. These units work by distributing warm air or water throughout a building. Furnaces typically blow heated air through ducts, while boilers circulate hot water through radiators. Proper maintenance of heating units is essential for safety and efficiency, ensuring they operate effectively during winter months.