Time to change out your furnace? Look for a high efficiency furnance!
How much does it cost to replace an old furnace with a new, high-efficiency model? That depends upon the circumstances. If the new unit can be connected to existing ductwork and an exhaust flue, it should run from about $3,000 to $4,500, installed. The higher the efficiency of the furnace, the higher the price. But keep in mind: Though high-efficiency models represent about $500 to $1,000 more in material costs than mid-efficiency units, they pay you back with energy savings and qualify for tax credits. The payback period depends on the price of the system, local energy costs, your climate, and the difference in efficiency between the old and new furnace.
http://www.hometips.com/buying-guides/high-efficiency-furnaces.html#how-much-does-a-furnace-cost?
