Heating systems are designed to maintain comfortable indoor temperatures during cold weather. Common types include furnaces, which heat air and distribute it through ducts, and boilers, which heat water for radiators or underfloor heating. Another popular option is heat pumps, which transfer heat from outside to inside, even in chilly conditions. Electric heaters are also used for smaller spaces, providing quick warmth. Each system has its own advantages and is chosen based on factors like efficiency, cost, and the size of the area to be heated.