Cách sử dụng
A furnace is a machine that is used to heat up a space, like a house or a building. It works by burning fuel, like gas or oil, to create heat. Furnaces are usually found in basements or utility rooms and are used during cold weather to keep the inside of the building warm. Some furnaces can also be used for industrial purposes, like melting metal or other materials. If you want to talk about heating your home, you can say "We turn on the furnace when it gets cold."