Heating and cooling systems are essential for maintaining comfortable indoor temperatures in homes and buildings. These systems can include various types, such as furnaces, air conditioners, and heat pumps. They work by either generating heat to warm up a space or removing heat to cool it down, ensuring a pleasant environment throughout the year. Most heating systems use natural gas, electricity, or oil as energy sources, while cooling systems typically rely on refrigerants to absorb and release heat. Regular maintenance of these systems is important for efficiency and longevity, helping to reduce energy costs and improve air quality.