Furnace System GuideDaikin and Goodman both sell gas furnaces across the efficiency range. This page collects the specs each brand publishes on its own site, brand by brand, then notes where they differ on paper. It does not pick a winner.
How to Read This Comparison
Every spec below is taken from each manufacturer's own furnace pages, and each brand describes its lineup differently, so direct one-to-one matching is imperfect. AFUE figures are the numbers each brand publishes.
AFUE measures fuel-to-heat efficiency only. It does not capture install quality, duct losses, dealer network, or price. Treat this as a paper-spec reference, not a verdict.
Where a brand did not publish a number on the page reviewed, this comparison leaves it out rather than estimating it.
Daikin, As Published
Daikin's DM97MC gas furnace is listed at up to 98 percent AFUE. Daikin states it uses a self-calibrating modulating gas valve and a variable-speed ECM motor, with an airflow system that gently ramps up or down according to heating or cooling demand.
Daikin describes a heavy-duty stainless-steel tubular heat exchanger and a stainless-steel secondary heat exchanger on the model. On coverage, Daikin lists a 12-Year Parts, 12-Year Unit, and 20-Year Heat Exchanger warranty, and states that the 12-Year Parts Limited Warranty requires online registration within 60 days of installation.
These are the figures Daikin publishes on its DM97MC page as of this review.
Goodman, As Published
Goodman describes its gas furnaces by efficiency tier. Goodman states that a 90 percent or higher AFUE rating means that 90-plus cents of every energy dollar warms the home, and that an 80 percent AFUE rating means that 80 cents of every energy dollar warms the home.
On hardware, Goodman distinguishes a multi-speed PSC blower, which uses a permanent split capacitor electric motor, from a multi-speed ECM blower, which uses an electronically commutated motor. Goodman also describes a tubular aluminized-steel heat exchanger with wrinkle bend technology.
These are the figures Goodman publishes on its gas furnace page as of this review.
Where They Differ on Paper
The pages present their top ends differently. Daikin publishes a named flagship, the modulating DM97MC at up to 98 percent AFUE, along with a specific 12-year parts and unit warranty. Goodman publishes efficiency tiers, 90-plus percent and 80 percent AFUE, rather than a single named top figure on the page reviewed.
Both brands describe tubular heat exchangers, though Daikin emphasizes stainless-steel primary and secondary exchangers while Goodman emphasizes an aluminized-steel exchanger. Both offer ECM and variable-speed blower options.
The published specs do not settle which furnace is better for a given home. Price, the local dealer, install quality, and warranty registration all sit outside these numbers.