How much does it cost to replace a gas furnace?

Replacing a gas furnace typically costs between $1,700 and $6,000 as of 2015, with installation of a high-efficiency furnace costing toward the upper end of this range. However, local labor rates and additional ventilation work can substantially inflate these prices.

Typical price ranges for a furnace installation assume that the house where the furnace is to be installed has adequate ducts available for the furnace to operate. If substantial duct repair or replacement is required due to the age of the home or incompatibility with the new furnace, costs for installation can as much as quadruple over the estimates for a typical installation.