The cost of replacing a furnace can depend on a number of factors including the size of the furnace you need. Determining furnace size means considering: Size of the home.
Number of people or pets in the home.
How many levels or stories are in the home.
Window directions.
Where the furnace will be installed.
Efficiency/comfort needs.
Type of furnace. A professional HVAC consultant can help determine the right size of furnace for your home and comfort.