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Goodman Downflow Furnace

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Goodman GDVT800603BX

Goodman 80% AFUE 60K BTU Furnace Variable Speed Low NOx 17.5"W Downflow/Horizontal

SKU: GDVT800603BX
Product ID: 101423
$0.00 - $0.00
$0.00
$2,082.00
$2,082.00 - $2,082.00
$2,082.00

Product Details Goodman 80% 60K BTU Gas Furnace Variable Speed Downflow/Horizontal 17.5"W GDVT800603BX The Goodman GDVT800603BX Gas Furnace is pa...

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GOODMAN GDVT961205DN

Goodman 96% AFUE 120K BTU Furnace Variable Speed 24.5"W Downflow/Horizontal

SKU: GDVT961205DN
Product ID: 101417
$0.00 - $0.00
$0.00
$3,434.00
$3,434.00 - $3,434.00
$3,434.00

Product Details Goodman 96% 120K BTU Gas Furnace Variable Speed Downflow/Horizontal 24.5"W GDVT961205DN The Goodman GDVT961205DN gas furnace deli...

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Goodman GDVT961005CN

Goodman 96% AFUE 100K BTU Furnace Variable Speed 21"W Downflow/Horizontal

SKU: GDVT961005CN
Product ID: 101416
$0.00 - $0.00
$0.00
$3,296.00
$3,296.00 - $3,296.00
$3,296.00

Product Details Goodman 96% 100K BTU Gas Furnace Variable Speed Downflow/Horizontal 21"W GDVT961005CN The Goodman GDVT961005CN Gas Furnace is engi...

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Goodman GDVT960804CN

Goodman 96% AFUE 80K BTU Furnace Variable Speed 21"W Downflow/Horizontal

SKU: GDVT960804CN
Product ID: 101415
$0.00 - $0.00
$0.00
$3,140.00
$3,140.00 - $3,140.00
$3,140.00

Product Details Goodman 96% 80K BTU Gas Furnace Variable Speed Downflow/Horizontal 21"W GDVT960804CN The Goodman GDVT960804CN is a high-efficiency...

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GOODMAN GDVT960603BN

Goodman 96% AFUE 60K BTU Furnace Variable Speed 17.5"W Downflow/Horizontal

SKU: GDVT960603BN
Product ID: 101414
$0.00 - $0.00
$0.00
$2,701.00
$2,701.00 - $2,701.00
$2,701.00

Product Details Goodman 96% 60K BTU Gas Furnace Variable Speed Downflow/Horizontal 17.5"W GDVT960603BN The Goodman GDVT960603BN Gas Furnace is a h...

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GOODMAN GDVT960403BN 01

Goodman 96% AFUE 40K BTU Furnace Variable Speed 17.5"W Downflow/Horizontal

SKU: GDVT960403BN
Product ID: 101413
$0.00 - $0.00
$0.00
$2,600.00
$2,600.00 - $2,600.00
$2,600.00

Product Details Goodman 96% 40K BTU Gas Furnace Variable Speed Downflow/Horizontal 17.5"W GDVT960403BN The Goodman GDVT960403BN is a premium two-...

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Goodman GDVM970804CN

Goodman 97% AFUE 80K BTU Furnace Variable Speed 21"W Downflow/Horizontal

SKU: GDVM970804CN
Product ID: 101409
$0.00 - $0.00
$0.00
$3,511.00
$3,511.00 - $3,511.00
$3,511.00

Product Details Goodman 97% AFUE 80K BTU Gas Furnace Variable Speed Downflow/Horizontal GDVM970804CN The Goodman GDVM970804CN is a premium gas fur...

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Goodman GD9T801005CX

Goodman 80% AFUE 100K BTU Gas Furnace Low NOx 21" Width Downflow/Horizontal

SKU: GD9T801005CX
Product ID: 100983
$0.00 - $0.00
$0.00
$1,720.00
$1,720.00 - $1,720.00
$1,720.00

Product Details Goodman R32 80% AFUE Gas Furnace 100K BTU 2-Stage 21" Wide Low NOx Downflow GD9T801005CX The Goodman GD9T801005CX gas furnace deli...

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Goodman GD9T800805CX

Goodman 80% AFUE 80K BTU Gas Furnace Low NOx 21"W Two-Stage Downflow/Horizontal

SKU: GD9T800805CX
Product ID: 100982
$0.00 - $0.00
$0.00
$1,626.00
$1,626.00 - $1,626.00
$1,626.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU Two-Stage 21"W Low NOx Downflow GD9T800805CX The Goodman GD9T800805CX is a reliable, high...

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Goodman GD9T800804BX

Goodman 80% AFUE 80K BTU Gas Furnace Low NOx 17.5"W Two-Stage Downflow/Horizontal

SKU: GD9T800804BX
Product ID: 100981
$0.00 - $0.00
$0.00
$1,575.00
$1,575.00 - $1,575.00
$1,575.00

Product Details Goodman 80% AFUE 80,000 BTU Gas Furnace Low NOx 17.5"W Downflow/Horizontal GD9T800804BX The Goodman GD9T800804BX is a high-effici...

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Goodman GD9T800603BX

Goodman 80% AFUE 60K BTU Gas Furnace Low NOx 17.5"W Two-Stage Downflow/Horizontal

SKU: GD9T800603BX
Product ID: 100980
$0.00 - $0.00
$0.00
$1,455.00
$1,455.00 - $1,455.00
$1,455.00

Product Details Goodman R32 80% AFUE Gas Furnace 60K BTU Two-Stage 17.5"W Low NOx Downflow GD9T800603BX The Goodman GD9T800603BX is a dependable 6...

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Goodman GD9T800403AX

Goodman 80% AFUE 40K BTU Furnace 9-Speed Low NOx 14"W 2-Stage Downflow/Horizontal

SKU: GD9T800403AX
Product ID: 100978
$0.00 - $0.00
$0.00
$1,369.00
$1,369.00 - $1,369.00
$1,369.00

Product Details Goodman R32 80% AFUE Gas Furnace 40000 BTU 14"W Two-Stage Low NOx Downflow GD9T800403AX The Goodman GD9T800403AX is a compact, ene...

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Goodman GD9S801005CX

Goodman 80% AFUE 100K BTU Gas Furnace 9-Speed Low NOx 21" W Downflow/Horizontal

SKU: GD9S801005CX
Product ID: 100977
$0.00 - $0.00
$0.00
$1,645.00
$1,645.00 - $1,645.00
$1,645.00

Product Details Goodman R32 80% AFUE Gas Furnace 100K BTU 21" Wide Low NOx Downflow GD9S801005CX The Goodman GD9S801005CX is a high-performance 10...

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Goodman GD9S800805CX

Goodman 80% AFUE 80K BTU Gas Furnace Multi-speed Low NOx 21"W Downflow/Horizontal

SKU: GD9S800805CX
Product ID: 100975
$0.00 - $0.00
$0.00
$1,521.00
$1,521.00 - $1,521.00
$1,521.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU 21"W Low NOx Downflow/Horizontal GD9S800805CX The Goodman GD9S800805CX is a high-efficien...

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Goodman GD9S800804BX

Goodman 80% 80K BTU Gas Furnace Low NOx 17.5"W Cabinet Downflow/Horizontal

SKU: GD9S800804BX
Product ID: 100974
$0.00 - $0.00
$0.00
$1,467.00
$1,467.00 - $1,467.00
$1,467.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU 17.5" Wide Low NOx Downflow GD9S800804BX The Goodman GD9S800804BX is an energy-efficient ...

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Goodman GD9S800403AX

Goodman 80% 40K BTU Gas Furnace Low NOx 14"W Cabinet Downflow/Horizontal

SKU: GD9S800403AX
Product ID: 100970
$0.00 - $0.00
$0.00
$1,200.00
$1,200.00 - $1,200.00
$1,200.00

Product Details Goodman R32 80% AFUE Gas Furnace 40K BTU 14"W Low NOx Downflow/Horizontal GD9S800403AX The Goodman GD9S800403AX is a compact, high...

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Goodman GD9S801005CN

Goodman 80% AFUE Gas Furnace 100K BTU 21" Width Cabinet Downflow/Horizontal

SKU: GD9S801005CN
Product ID: 100976
$0.00 - $0.00
$0.00
$1,635.00
$1,635.00 - $1,635.00
$1,635.00

Product Details Goodman R32 80% AFUE Gas Furnace 100K BTU 21"W 2000 CFM Downflow/Horizontal GD9S801005CN The Goodman GD9S801005CN Gas Furnace deli...

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Goodman GD9S800403AN

Goodman 80% AFUE Gas Furnace 40K BTU 14" Width Cabinet Downflow/Horizontal

SKU: GD9S800403AN
Product ID: 100969
$0.00 - $0.00
$0.00
$1,190.00
$1,190.00 - $1,190.00
$1,190.00

Product Details Goodman R32 80% AFUE Gas Furnace 40K BTU 14"W 1200 CFM Downflow/Horizontal GD9S800403AN The Goodman GD9S800403AN gas furnace is a ...

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Goodman GD9T961005CN

Goodman 96% AFUE 100K BTU Gas Furnace 21"W Two Stage Downflow/Horizontal

SKU: GD9T961005CN
Product ID: 100921
$0.00 - $0.00
$0.00
$2,663.00
$2,663.00 - $2,663.00
$2,663.00

Product Details Goodman 96% AFUE 100K BTU Gas Furnace R32 Two Stage Downflow/Horizontal GD9T961005CN The Goodman GD9T961005CN delivers high-effici...

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Goodman GD9T960403BN

Goodman 96% AFUE Gas Furnace 40,000 BTU Two Stage 17.5" Downflow/Horizontal

SKU: GD9T960403BN
Product ID: 100918
$0.00 - $0.00
$0.00
$2,052.00
$2,052.00 - $2,052.00
$2,052.00

Product Details Goodman R32 96% AFUE Gas Furnace 40000 BTU Two Stage Downflow/Horizontal GD9T960403BN Designed for reliable comfort and energy eff...

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Goodman GD9S961205DN

Goodman 96% AFUE Gas Furnace 120K BTU 24.5"W Nine-Speed Downflow/Horizontal

SKU: GD9S961205DN
Product ID: 100917
$0.00 - $0.00
$0.00
$2,702.00
$2,702.00 - $2,702.00
$2,702.00

Product Details Goodman R32 96% AFUE Gas Furnace 120K BTU Nine-Speed Downflow/Horizontal GD9S961205DN The Goodman GD9S961205DN is a high-performan...

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Goodman GD9S961005CN

Goodman 96% AFUE Gas Furnace 100000 BTU 21"W Nine-Speed Downflow/Horizontal

SKU: GD9S961005CN
Product ID: 100916
$0.00 - $0.00
$0.00
$2,470.00
$2,470.00 - $2,470.00
$2,470.00

Product Details Goodman R32 96% AFUE Gas Furnace 100K BTU Nine-Speed Downflow/Horizontal GD9S961005CN Enhance your home’s comfort and energy effic...

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Goodman GD9S960804CN

Goodman 96% AFUE Gas Furnace 80,000 BTU 21"W Nine-Speed Downflow/Horizontal

SKU: GD9S960804CN
Product ID: 100915
$0.00 - $0.00
$0.00
$2,228.00
$2,228.00 - $2,228.00
$2,228.00

Product Details Goodman R32 96% AFUE Gas Furnace 80000 BTU Nine-Speed Downflow/Horizontal GD9S960804CN The Goodman GD9S960804CN is engineered to p...

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Goodman GD9S960403BN

Goodman 96% 40,000 BTU Gas Furnace Single Stage 17.5" W Downflow/Horizontal

SKU: GD9S960403BN
Product ID: 100913
$0.00 - $0.00
$0.00
$1,856.00
$1,856.00 - $1,856.00
$1,856.00

Product Details Goodman 96% 40,000 BTU Gas Furnace Single Stage 17.5" W Downflow/Horizontal GD9S960403BN Upgrade your home's heating efficiency w...

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A downflow gas furnace goes into a house that heats from the top down, which is typically a property with the furnace installed in an attic, second floor, or closet above the conditioned space. Airflow direction matters because retrofits, custom builds, and manufactured homes don't all share the same duct layout, and selecting the wrong orientation forces installers into expensive workarounds. Goodman's downflow lineup exists for the buyer who has already figured out which direction the air needs to travel.

HVAC Store carries the full Goodman downflow gas furnace range, from 80% AFUE value tier up to 97% AFUE variable-speed modulating units that qualify for utility rebates in many regions. Inventory ships through authorized channels, which keeps the manufacturer warranty intact and gives installers the documentation required for permits and rebates. Sales support helps match BTU, cabinet width, and staging to the existing duct system rather than forcing a spec change.

Why Choose Goodman Downflow Furnaces from HVAC Store?

  • Every Goodman downflow gas furnace ships with the full factory warranty paperwork.

  • Complete BTU and cabinet width range in stock across 80%, 96%, and 97% AFUE efficiency tiers.

  • Support team helps match the furnace to existing ductwork, gas supply, and electrical before purchase.

  • Freight shipping with liftgate service keeps delivery manageable for residential and contractor sites.

You Might Also Like

  • Goodman Upflow Furnace Upflow orientation for homes where the furnace sits in a basement or utility room below conditioned living space, rather than above it.

  • All Downflow Furnaces: Cross-brand downflow inventory, useful for comparing Goodman against ACiQ and other options at the same BTU and efficiency tier.

  • Goodman Furnace Systems: -- Complete Goodman furnace category covering every orientation and efficiency tier, the right starting point for buyers still narrowing a spec.

  • Goodman Heat Pump and Furnace Systems: -- Dual-fuel hybrid bundles combining a Goodman heat pump with a gas furnace for buyers targeting the lowest annual operating cost.

Best Goodman Downflow Furnaces for...

Attic-Installed Systems

The best Goodman downflow furnace for an attic install is one with horizontal orientation already built in. The Goodman 60,000 BTU 96% AFUE single-stage downflow gas furnace handles most single-family attic installs efficiently.

Mobile and Manufactured Homes

Best Goodman downflow gas furnace for mobile and manufactured homes is a compact 14-inch cabinet unit. The Goodman 60,000 BTU 80% AFUE low NOx single-stage downflow gas furnace fits narrow utility closets common in that construction.

Budget-Focused New Construction

For budget-focused new construction, the best Goodman downflow furnace is an 80% AFUE single-stage model. The Goodman 40,000 BTU 80% AFUE single-stage upflow/downflow gas furnace delivers reliable heat at the lowest upfront cost in the catalog.

Premium Efficiency Retrofits

The best premium efficiency Goodman downflow furnace is a 97% AFUE variable-speed modulating unit. The Goodman 80,000 BTU 97% AFUE variable-speed modulating downflow gas furnace reduces utility bills substantially and qualifies for efficiency rebates in most states.

 

FAQ

What is a Goodman downflow furnace?

A Goodman downflow furnace pulls return air from the top of the unit and discharges heated supply air out the bottom, which suits installations where ductwork runs below the furnace. Most Goodman downflow models also support horizontal orientation.

When should I use a downflow vs upflow furnace?

Use a Goodman downflow furnace when the unit sits above the ducted space it heats, such as an attic or second-floor utility closet. Upflow furnaces suit basements and ground-floor utility rooms where ductwork runs overhead.

What BTU size Goodman downflow gas furnace do I need?

Size a Goodman downflow gas furnace at roughly 30 to 50 BTU per square foot depending on climate zone and insulation quality. A 2,000 square foot home typically needs 60,000 to 80,000 BTU of heating capacity.

What's the difference between 80%, 96%, and 97% AFUE?

AFUE measures how much fuel input converts to usable heat. An 80% AFUE furnace loses 20% through exhaust; a 96% model loses only 4%. Higher AFUE costs more upfront but produces lower gas bills for the life of the unit.

Can a Goodman downflow furnace run on propane?

A Goodman downflow gas furnace can convert to propane operation using the manufacturer's LP conversion kit. The kit adjusts the burner orifices and gas valve for LP pressure; installation should be performed by a licensed technician.

Do Goodman downflow furnaces work with heat pumps?

Goodman downflow furnaces pair with Goodman heat pump condensers to form dual-fuel systems, where the heat pump handles moderate temperatures and the furnace takes over in cold weather. This combination typically offers the lowest annual operating cost.