Online reviews of Lennox furnaces are available at Lennox.com and FurnaceCompare.com as of 2015. Both sites have hundreds of reviews of multiple models. FurnaceCompare.com includes reviews for both current and discontinued models.
Lennox.com includes information about 10 gas furnace models and three oil furnaces. All of the models have customer ratings of at least four stars. Most reviewers state that their furnaces are quiet and reliable. Some reviewers on FurnaceCompare.com state that their furnaces have serious problems and are costly to repair.
Lennox has a 120-year history as a furnace manufacturer. The company also produces boilers, indoor air quality systems and air conditioners, including solar-powered models.