What is the cost of having a wood furnace?

A lot will depend on where you have the furnace installed as you must have a chimney to carry the smoke outside. There is the cost of the furnace itself which must be sized properly so that it can heat the entire space. You must have the chimney or flue cleaned every year and other maintenance must be performed regularly - like removing the ashes. You must have enough wood to burn to heat the space you have in mind for the entire winter.