Furnace System GuideTempstar publishes a product page for its F97CMN Ion 98 gas furnace. This entry records what that page states about the furnace's efficiency, modulation, blower motor, and registered warranty coverage.
F97CMN efficiency, modulation, and blower
Tempstar's product page titles the F97CMN the Ion 98 Variable-Speed Modulating Gas Furnace and states it is rated up to 98 percent AFUE. Tempstar describes a modulating gas valve operating across a range of 40 to 100 percent capacity to match heating demand.
Tempstar's page lists a high-efficiency variable-speed, constant-airflow ECM blower motor. Tempstar presents the modulating valve and variable-speed blower as its top-tier comfort combination.
Warranty terms as documented
Tempstar's F97CMN page states a Lifetime Heat Exchanger Limited Warranty on timely registration, which reduces to 20 years if the unit is not registered within 90 days of installation. The page states a 10-Year Parts Limited Warranty on timely registration, reduced to 5 years without registration.
Tempstar also lists a 10-Year No Hassle Replacement Limited Warranty. The warranty terms are recorded as written on the product page.