how much does it cost to put in a new gas furnace
1 The typical gas furnace cost is $3,000 to $6,000 installed, although higher efficiency models and/or complex installations could push the cost up to $7,500 to $10,000 or more. 2  Oil furnace cost is roughly $2,500 to $5,000 installed, but similar to gas furnace prices, itâs not unheard of to spend $10,000+. Efficiency: Furnace efficiency measures how much fuel a unit converts to heat, and how much is lost up the chimney. 2  The national minimum efficiency standard is 78%, while some new models are up to 98.2% efficient. 3  The latter cost more, but will cut fuel costs and are better for the planet.