Up to 80% AFUE Performance Multi-Position Installation Single-Stage, Multi-Speed ★★★★★ ★★★★★ 4.7 out of 5 stars. Read reviews. 4.7 676 Reviews 656 out of 660 (99%) reviewers recommend this product Outstanding Warranty Protection If the heat exchanger ever fails in this unit, the original registered owner will receive a new heat exchanger. This furnace also has a 10-Year Parts Limited Warranty on all other functional parts. For a full description of all warranties applicable to this product, please review the consumer brochure or product warranty by clicking on the links above. This gas furnace has an AFUE rating of 80%, which means that 80 cents of every $1.00 of heating energy expense warms your home. Additional Information Before purchasing this appliance, read important information about its estimated annual energy consumption, yearly operating cost, or energy efficiency rating that is available from your retailer.