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The Goodman GR9S800403AU is a single-stage gas furnace rated at 40,000 BTU input and 80% AFUE, with a 1200 CFM multi-speed ECM blower in a 14-inch cabinet. It installs upflow or horizontal and is built for dependable forced-air heating rather than top-tier efficiency. The multi-speed blower is the standout for this class: it holds airflow steadier and runs quieter than the fixed-speed motors common on budget single-stage furnaces. It suits garages, rentals, mild-climate homes and replacements where a pro is doing the install; buyers in cold climates should weigh it against 90%+ condensing models, which cost more but cut gas use.
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Lowest price we've seen: $1,580.00 on Nov 14 at Alpine Home Air Products. Tracked across 12 stores since Nov 14.
Owners and installers rate the GR9S80 line well overall, praising simple installs and steady blower performance. The recurring complaints are the 80% efficiency and the on/off cycling of a single-stage burner.
The Goodman GR9S800403AU is a single-stage gas furnace for forced-air heating. It has a 40,000 BTU capacity and an 80% AFUE rating. It belongs to the GR9S80 product line.
It uses a single-stage gas valve and a multi-speed ECM blower. The maximum airflow class is 1200 CFM. The furnace is configured for upflow or horizontal installation, and its cabinet is 14 in wide. Professional installation is recommended.
