The answer to 'difference between furnace and heat pump' is that a furnace uses fuel like natural gas or propane to generate heat, while a heat pump uses electricity to transfer heat from the outside air into your home. Furnaces are generally more common in colder climates, while heat pumps are better suited for milder climates.
Furnaces tend to have higher upfront costs but lower operating costs, while heat pumps have lower installation costs but higher electricity bills. Furnaces also require annual maintenance like cleaning and filter changes, while heat pumps have fewer maintenance needs. Ultimately, the best choice depends on your home's heating needs, climate, and budget.