An 80,000 BTU Goodman gas furnace at 90 percent efficiency has an average base price of $695, as of 2015. Equivalent furnaces from other manufacturers range from $680 to $1,410, with an average of $1,215. Goodman is at the lower end of the price range, along with Payne and Coleman.
Goodman's 95 percent efficient GMH series two-stage gas furnace has an average price of $1,225. With professional installation, the total average cost is $3,100. The average cost for equivalent furnaces among all brands is $1,860, with an average installation cost of $3,710. According to Furnace Compare, 42 percent of Goodman furnace customers recommend the brand. Out of 378 reviews, 149 customers were very satisfied with their purchase. Of those 378 reviewers, 184 were very unsatisfied.