Furnace Compare and Consumer Search both provide reviews of furnaces by brand and type, as well as information about selecting a furnace. Consumer Reports offers reviews of gas furnaces by brand.
Furnace Compare provides a comprehensive library of reviews by brand and in 2014 compiled an overall top 10 list including information on efficiency and price. Consumer Search and Consumer Reports compare the primary types of furnace, including boiler, gas furnace and heat pump. Consumer Search offers a buying guide with questions to consider before selecting a furnace. Both Consumer Reports and Consumer Search include information to help buyers decide whether to repair or replace a furnace before making a major purchase.