Goodman GDH8; 80% AFUE; 40,000 BTU; Two Stage Multi-Speed Gas Furnace

Standard Downflow Blower with 1,200 Max CFM. Natural Gas with Low NOx Emissions. 14" Cabinet Width

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Goodman established itself as the largest HVAC manufacturer in the US by producing high-quality, efficient equipment and providing it to homeowners at a great value. The GDH8 two-stage, multi-speed furnace utilizes Goodman's superior heat exchanger design to provide efficient, reliable heating to your home. This furnace also excels at providing comfortable circulation in a variety of conditions thanks to its four-speed blower motor. Designed for ease of installation, the GDH8 furnace has multiple options for gas, electrical, and return air connections. Maintenance is just as easy thanks to the unit's self-diagnosing control board. Backed by Goodman's generous warranty, the GDH8 provides comfort and peace of mind to homeowners.

Advanced Heat Exchanger Design
The GDH8 furnace employs a reliable dual-diameter tubular heat exchanger design. Aluminized steel is used for incredibly efficient heat transfer, and a wrinkle-bend is applied to the tubes to enhance the heat exchanger's dependability and longevity.

DualSaver Technology
DualSaver Technology allows GDH8 furnaces to begin operating at the lower stage for ideal efficiency. The control board uses historical data about the rate of temperature change in your home to decide whether the higher stage of heating is necessary.

Quiet Comfort
The blower, motor, and gas valve of the GDH80403AX were selected for their incredibly low sound levels.

Secure Cabinet
All GDH8 furnaces are protected by a durable steel cabinet with a long-lasting powder paint finish. The heat exchanger section of the cabinet is lined with foil-insulation to prevent heat loss.

Easy Integration
The GDH80403AX makes it simple to enhance your system with a humidifier and an electronic air cleaner; just wire them directly to the low-voltage terminals on the control board.

Extended Warranty
Goodman offers a 10-year limited unit replacement and parts warranty when you register your product online within 60 days of installation. An unregistered product has the standard 5-year warranty. See the "Manuals" tab for more information.


General Information
TypeGas Furnace
Product LineGDH8
Fuel Type Natural Gas
Vent TypeChimney Vent
Modulating/Staging Two Stage
Blower MotorPSC Multi-Speed
Gas Conversion KitAvailable
Installation AvailableYes


AFUE 80 %
Heating BTU40000
High Fire Input40000 BTU
High Fire Output32000 BTU
Low Fire Input30000 BTU
Low Fire Output24000 BTU
Maximum Air Flow1200 CFM
Ultra Low NOx EmissionsNo

Flue Connection Size4 Inches
Cabinet Width14 Inches
Product Height33 1/2 Inches
Product Width14 Inches
Product Depth28 Inches
Product Weight88 Pounds
Shipping Weight88 Pounds


ETL ListedYes
AHRI CertifiedYes
ISO CertifiedYes
AHRI Reference Number5012567