As of 2015, typical gas furnaces operate more efficiently than oil furnaces, although they still offer substantial efficiency savings over wood-burning furnaces. In addition, the lower cost of natural gas in the United States makes them more economical.
Gas furnaces cost more than oil furnaces, although the difference is small enough to make gas furnaces a cheaper option in most cases. While the cost of natural gas can fluctuate, most projections show the cost of natural gas staying far below the cost of oil, which fluctuates in price regularly, for the foreseeable future. The convenience of heating oil for those living in remote locations without a gas line, however, may make an oil furnace a better option.