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Carrier

Carrier documents a residential gas furnace lineup led by the Infinity 98 (model 59MN7), a modulating, variable-speed condensing furnace rated up to 98.5 percent AFUE.

Carrier publishes model-level specifications for its Infinity series gas furnaces. This entry records what Carrier's own product page states about the flagship Infinity 98, including its efficiency rating, gas valve behavior, blower type, and registered warranty terms.

Flagship Infinity 98 efficiency and staging

Carrier's product page for the Infinity 98 Gas Furnace identifies the model number as 59MN7. The same page states the furnace reaches up to 98.5 percent AFUE, which places it in the condensing furnace class.

Carrier's page describes the unit as using a modulating gas valve that adjusts in 1 percent increments. Carrier pairs that valve with a variable-speed blower. Carrier presents this combination as its highest documented residential furnace efficiency tier.

Warranty terms as documented

Carrier's 59MN7 page states that, upon timely registration, the heat exchanger carries a lifetime limited warranty. The same page describes a parts warranty option.

Carrier's page states the owner may select either a 10-year parts-only limited warranty or a 5-year parts warranty plus a 3-year labor limited warranty, in each case upon timely registration. These terms are as written on Carrier's product page and are conditioned on registration.