Ans: While it's not 100% necessary, putting a curtain around the furnace can help to keep your home cooler in the summer and warmer in the winter. This is due to two main reasons: 1) The heat from the furnace escapes through the curtain and travels into your home slowly. 2) The curtains create an insulating barrier between yourself and the outside environment. In addition, this safety measure can prevent accidental fires caused by sparks flying off of metal items that are close to or touching a fire.