Lennox lists more than 10 residential furnace models on its website. Of those, only available are gas furnaces with 90%+ efficiency –  total six furnaces. They are called high-efficiency furnaces. Lennox makes it easy to compare furnaces.  On Lennox’s furnaces page check up to three models at a time. In this picture, the models checked are SLP98V,  EL296V AND EL296E.

Notice, as you are adding models, they appear at the bottom of the page. All you need to do now is to click on the red COMPARE button on the bottom right.