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Downflow Furnaces

Shop downflow furnaces built for slab foundations, attics, and main-floor closet installs.

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Goodman GD9S800804BN

Goodman 80% AFUE Gas Furnace 80,000 BTU 17.5"W Cabinet Downflow/Horizontal

SKU: GD9S800804BN
Product ID: 100973
$0.00 - $0.00
$0.00
$1,460.00
$1,460.00 - $1,460.00
$1,460.00

Product Details Goodman R32 80% AFUE Gas Furnace 80000 BTU 17.5" Wide 1600 CFM Downflow GD9S800804BN The Goodman GD9S800804BN gas furnace delivers...

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Goodman GD9T960803BN

Goodman 96% 80,000 BTU Gas Furnace Two Stage 17.5"W Downflow/Horizontal

SKU: GD9T960803BN
Product ID: 100920
$0.00 - $0.00
$0.00
$2,560.00
$2,560.00 - $2,560.00
$2,560.00

Product Details Goodman 96% 80,000 BTU Gas Furnace Two Stage 17.5"W Downflow/Horizontal GD9T960803BN The Goodman GD9T960803BN gas furnace offers p...

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Goodman GD9T960603BN

Goodman 96% 60K BTU Gas Furnace Two Stage 17.5" Width Downflow/Horizontal

SKU: GD9T960603BN
Product ID: 100919
$0.00 - $0.00
$0.00
$2,187.00
$2,187.00 - $2,187.00
$2,187.00

Product Details Goodman 96% 60K BTU Gas Furnace Two Stage 17.5" Width Downflow/Horizontal GD9T960603BN The Goodman GD9T960603BN Gas Furnace combin...

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Goodman GD9S960603BN

Goodman 96% 60,000 BTU Gas Furnace Single Stage 17.5"W Downflow/Horizontal

SKU: GD9S960603BN
Product ID: 100914
$0.00 - $0.00
$0.00
$1,931.00
$1,931.00 - $1,931.00
$1,931.00

Product Details Goodman 96% 60K BTU Gas Furnace Single Stage 17.5"W Downflow/Horizontal GD9S960603BN The Goodman GD9S960603BN Gas Furnace delivers...

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ACiQ AQ-GD9T800804BX

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

SKU: AQ-GD9T800804BX
Product ID: 92505
$0.00 - $0.00
$0.00
$1,375.00
$1,375.00 - $1,375.00
$1,375.00

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

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Goodman GDVM970803BN

Goodman 97% AFUE 80K BTU Furnace Variable Speed 17.5"W Downflow/Horizontal

SKU: GDVM970803BN
Product ID: 101408
$0.00 - $0.00
$0.00
$3,463.00
$3,463.00 - $3,463.00
$3,463.00

Product Details Goodman 97% AFUE 80K BTU Variable Speed Modulating Gas Furnace 17.5" Width GDVM970803BN The Goodman GDVM970803BN is part of Goodma...

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Goodman GDVM970603BN

Goodman 97% AFUE 60K BTU Furnace Variable Speed 17.5"W Downflow/Horizontal

SKU: GDVM970603BN
Product ID: 101366
$0.00 - $0.00
$0.00
$3,036.00
$3,036.00 - $3,036.00
$3,036.00

Product Details Goodman 97% AFUE 60K BTU Gas Furnace Variable Speed Downflow/Horizontal GDVM970603BN Upgrade your home comfort system with this hi...

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Goodman GDVT800803BX

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

SKU: GDVT800803BX
Product ID: 101424
$0.00 - $0.00
$0.00
$2,260.00
$2,260.00 - $2,260.00
$2,260.00

Product Details Goodman 80% AFUE 80,000 BTU Two Stage Gas Furnace 17.5" Downflow/Horizontal GDVT800803BX The Goodman GDVT800803BX Gas Furnace is ...

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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 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 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 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 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 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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Airflow direction is the one furnace spec your house decides for you. A downflow furnace pulls in return air at the top and sends heated air out the bottom, which is exactly what a home on a slab foundation or with under-floor ductwork needs. If your last furnace sat in a main-floor closet, an attic, or a garage with ducts running below, a downflow gas furnace is almost certainly what you are replacing it with.

Chances are you already know your configuration and are comparing efficiency tiers and staging from there. If you are not yet sure which orientation your home takes, our upflow vs downflow furnace guide settles it quickly, and larger homes running high heating loads can step directly into our 100,000 BTU Downflow Furnaces range. Our team will confirm fit and capacity before your order ships.

Why Choose Downflow Furnaces from HVAC Store?

•  Every downflow model we carry is built to the highest standards of quality and performance.

•  Comprehensive warranty coverage protects your heating system for genuine peace of mind.

•  Efficiency choices from 80% to 96% AFUE suit every climate and budget.

•  Our dedicated team confirms airflow orientation and capacity before you commit.

You Might Also Like

•  Upflow Furnaces - Switch to upflow models if your furnace lives in a basement with ductwork running overhead.

•  Goodman Downflow Furnaces - Narrow the field to Goodman's downflow lineup when you already know and trust the brand's equipment.

•  Furnaces - Compare the full furnace catalog across every airflow orientation, efficiency tier, and brand that we currently stock.

Best Downflow Furnaces for...

Slab Homes and Main-Floor Closets

The best downflow furnace for slab homes is a compact-width model that fits tight closets. The Goodman 80% AFUE 60K BTU Two-Stage Low NOx Furnace squeezes into 14-inch spaces.

Fuel-Efficiency Upgrades

The best downflow gas furnace for lowering fuel bills is a condensing 96% AFUE model. The Goodman 96% 80,000 BTU Two-Stage Furnace pays back its premium every heating season.

Larger Homes and Cold Winters

The best counterflow furnace for big homes in cold climates is high output with variable-speed airflow. The Goodman 96% 120K BTU Variable Speed Furnace heats large layouts evenly.

Attic Installs and Flexible Orientation

The best pick for attics is a convertible downflow and horizontal model. The ACiQ 40K BTU 96% AFUE 9-Speed Two-Stage Furnace adapts to whichever way your attic ducts run.

Quick Spec Comparison

Here is how the right downflow furnace lines up by application, so you can match output and efficiency to your home before you shortlist a model.

Application

Recommended Unit

BTU

Efficiency (AFUE)

Stand-out Feature

Slab homes and main-floor closets

Goodman 80% 60K BTU Two-Stage Low-NOx Downflow Furnace

60,000

80% AFUE

Two-stage, low NOx, 14" cabinet

Fuel-efficiency upgrades

Goodman 96% 80K BTU Two-Stage Downflow Furnace

80,000

96% AFUE

Two-stage, downflow / horizontal

Larger homes and cold winters

Goodman 96% 120K BTU Variable-Speed Downflow Furnace

120,000

96% AFUE

Variable speed, 24.5" cabinet

Attic installs and flexible orientation

ACiQ 40K BTU 96% 9-Speed Two-Stage Downflow Furnace

40,000

96% AFUE

9-speed ECM, downflow / horizontal

 

FAQ

What is a downflow furnace?

A downflow furnace draws return air in at the top, heats it over the heat exchanger, and discharges warm air out the bottom into ductwork below. It is the standard configuration for slab-foundation homes, main-floor closets, attics, and garages.

Is a counterflow furnace the same as a downflow furnace?

Yes. Counterflow and downdraft are simply other names for a downflow furnace; all three describe the same top-in, bottom-out airflow pattern. If a spec sheet says counterflow, every model in this collection matches that requirement.

When should I choose a downflow furnace over an upflow model?

Choose downflow when your ductwork runs beneath the furnace, which is typical of slab foundations, crawl-space homes with under-floor ducts, and attic installations. Homes with basements and overhead duct runs generally take upflow models instead.

What efficiency ratings do downflow furnaces come in?

Downflow furnaces in this collection run from 80 to 96 percent AFUE. The 96 percent condensing models extract more heat from every unit of fuel, while 80 percent models keep purchase costs lower in milder climates or smaller spaces.

Do downflow furnaces come in low NOx versions?

Yes. Several Goodman and ACiQ downflow models are low NOx certified, which reduces nitrogen oxide emissions. If your area enforces low NOx requirements, common in parts of California, filter for those models or ask our team to point them out.

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