Installing new ducts costs $2,400 to $6,600. Replacing a gas furnace sometimes includes removing old ducts or cleaning the existing ductwork for better airflow, especially in older homes. The cost to install a new gas furnace and ductwork is $4,400 to $11,800. The cost to replace a gas furnace depends on the unit’s efficiency and size in BTUs, ductwork modifications, labor, permits, and installation complexity. Adding a heat pump costs $2,500 to $6,000 more. Hybrid heating or dual-fuel systems that use an air-source heat pump and gas furnace are the most energy-efficient. Furnaces in the 80's are standard-efficiency.įurnaces lose heat through air leaks, inefficient burners, exhaust, or a less-advanced design.Ī high-efficiency unit may be eligible for an Energy Star federal tax credit of up to $300 and other local rebates. High-efficiency furnaces have an AFUE in the 90's. A furnace with an AFUE of 90 turns 90% of its fuel into usable heat. A higher AFUE percentage produces more heat with less fuel, lowering fuel costs. The Annual Fuel Utilization Efficiency (AFUE) rating measures the energy efficiency of furnaces. Variable heat settings such as two-stage or multi-speed blowers to lower natural gas billsĪ secondary heat exchanger costs $1,000 to $2,000 to prevent heat loss through ventsĬondensation-drain design to reduce emissions Multiple fan speed options to save electricity costs

A high-efficiency gas furnace is worth the cost for these extra benefits:

Concord 80 plus gas furnace manual