Ducane's top of the line 95G2V gas furnace ranges in price from $1,949 to $2,789, as of 2015. This two-stage variable-speed furnace is Energy Star certified at 95 percent efficiency. The 95G2V is available in five models with heating capacities ranging from 44,000 to 135,000 BTU.
Ducane's 95 percent efficient single-stage 95G1E ranges in price from $1,589 to $2,389, with five capacity options ranging from 44,000 to 132,000 BTU. This gas furnace is equipped with an energy-efficient multi-speed blower. The Ducane 80G2V offers two-stage heating with a variable-speed motor but is less efficient at only 80 percent. The 80G2V ranges from $1,859 to $2,369 with three capacity options: 66,000 BTU, 88,000 BTU and 110,000 BTU.