When your home heating system isn't really getting hot anymore or the unit fails to even come on, and you've checked the thermostat and the pilot light, you may be ready for a furnace replacement. Before you order a new unit from a catalog or website, you'll want to consult with a furnace replacement professional to ensure that you're selecting the best and most cost-efficient model for the size of your home and geographic region. Below we will discuss the costs involved in replacing various different types of furnace. Before you begin hunting for a new furnace, though, make sure you are up to date with the average cost to replace a furnace so you can avoid overspending. It would also be wise to brush up on your HVAC terminology so you are up to speed when speaking with a contractor.