The cost to heat a home with wood when buying firewood will depend on the size of the home and how cold your winters are.
Most homes though will go through at least 1 cord of firewood per month which ranges in cost from $250.00 to $300.00 per cord depending on location and species of firewood.
So it could cost you between $250.00 to $400.00 per month to heat your home with firewood.
That's still certainly cheaper than buying heating oil or propane.
But natural gas may be cheaper to heat with if it's available in your location.