Gas Floor Furnace Cost

• A gas floor furnace, which is installed directly underneath the floors wherein heat rises from a grill on the floor, costs about $900 to as much as $1,500, according to the Cost Helper website. The estimate increases from about $1,000 to $2,000 with installation.
  
  

Gas Wall Furnace Costs

• A self-contained, vented, gas wall furnace sits in or against the wall and provides heat in your home. The cost of a gas wall furnace ranges from about $500 to $1,500. The cost of installation for a gas wall furnace is the same as for a gas floor furnace.
  
  

Central Heating Furnace Costs

• A central heating gas furnace with a mid-efficiency unit costs about $1,700 to as much as $7,500, states Cost Helper. A high-efficiency gas furnace costs about $2,500 to over $10,000. These estimates are based on whether you have existing usable ductwork and the complexity of installation.
  
  

Additional Costs

• Additional costs may include a fire inspection that some local governments require, and that may cost about $25 to $75. You might have to install a chimney liner for a high-efficiency furnace, which could cost about $300 to as much as $700. Asbestos removal may cost about $1,500 to as much as $3,000, no matter how small the job, according to Cost Helper. You may need to pay for an air cleaner and a programmable thermostat, which can total about $900 to $1,200.