- ENERGY STAR qualifying efficiency up to 98% AFUE provides more heat for less. - Modulating design continuously adjusts heating level in small increments to match the degree of comfort you need precisely. - Variable speed blower provides quiet, efficient circulation. - Integrated ClimaTrak Comfort System tailors operation to the needs of your locale. - Best Buy Award We are proud to announce a Consumers Digest Award was designated to the York AffinityTM Series YP9C modulating gas furnace. - Good Housekeeping Seal This model is proud to have earned the Good Housekeeping Seal a nearly century old symbol of quality and trust. - 10-Year Limited Parts and Lifetime Heat Exchanger Warranties This product is covered by some of the best warranties in the business: 10 year limited parts and lifetime heat exchanger warranties. - ENERGY STAR The ENERGY STAR label means this product is at least 15 to 25% more efficient than standard products, meeting strict EPA and DOE guidelines. - This blower technology adjusts gradually to deliver precise comfort without wasting energy