An oil furnace is a heating system that uses oil as its primary fuel source to generate heat for residential or commercial spaces. It works by burning oil in a combustion chamber, which produces hot air or steam that is then circulated throughout the building. Oil furnaces are known for their efficiency and ability to provide consistent warmth, especially in colder climates. These furnaces typically require an oil tank to store the fuel, which can be located above or below ground. Regular maintenance, including cleaning and inspections, is essential to ensure optimal performance and safety. Oil furnaces are often chosen for their reliability and effectiveness in heating large areas.