The answer to 'how much does furnace cost' is that the cost of a new furnace can vary widely depending on several factors. As a general guideline, you can expect to pay anywhere from $2,000 to $10,000 or more for a new furnace, including installation. The specific cost will depend on the size and efficiency of the unit, the brand, the complexity of the installation, and your local labor and material costs.
Factors that influence the cost of a new furnace include the type of fuel (gas, electric, or oil), the AFUE (annual fuel utilization efficiency) rating, the size of your home, the difficulty of the installation, and any necessary ductwork modifications. Upgrading to a more energy-efficient model can also add to the upfront cost but may save you money in the long run through lower utility bills.