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Upflow Furnaces

Upflow and horizontal gas furnaces from 30,000 to 120,000 BTU across every efficiency tier we carry.

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Goodman GR9S800403AU

Goodman 80% AFUE 40K BTU Gas Furnace 9-Speed Ultra-Low NOx 14"W Upflow/Horizontal

SKU: GR9S800403AU
Product ID: 107401
$2,400.00
$2,400.00 - $2,400.00
$2,400.00
$1,800.00
$1,800.00 - $1,800.00
$1,800.00

Product Details Goodman 80% 40K BTU Gas Furnace Ultra-Low NOx 14" Width Upflow/Horizontal GR9S800403AU The Goodman GR9S800403AU Gas Furnace offers...

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Goodman GR9T801005CX

Goodman 80% AFUE 100K BTU Furnace 9-Speed Low NOx 21" W Two Stage Upflow/Horizontal

SKU: GR9T801005CX
Product ID: 107467
$2,205.00
$2,205.00 - $2,205.00
$2,205.00
$1,654.00
$1,654.00 - $1,654.00
$1,654.00

Product Details Goodman R32 80% AFUE Gas Furnace 100K BTU Two-Stage Low NOx 21" Wide Upflow The Goodman 80% AFUE R32 2-Stage Gas Furnace provides ...

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Goodman GR9T800805DX

Goodman 80% AFUE 80K BTU Furnace 9-Speed Low NOx 24.5"W Two Stage Upflow/Horizontal

SKU: GR9T800805DX
Product ID: 107464
$2,135.00
$2,135.00 - $2,135.00
$2,135.00
$1,601.00
$1,601.00 - $1,601.00
$1,601.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU Two-Stage Low NOx 24.5"W Upflow The Goodman 80% AFUE R32 2-Stage Gas Furnace provides 80,...

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Goodman GR9T800805CX

Goodman 80% AFUE 80K BTU Furnace 9-Speed Low NOx 21"W Two Stage Upflow/Horizontal

SKU: GR9T800805CX
Product ID: 107463
$2,088.00
$2,088.00 - $2,088.00
$2,088.00
$1,566.00
$1,566.00 - $1,566.00
$1,566.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU Two-Stage Low NOx 21" Wide Upflow The Goodman 80% AFUE R32 2-Stage Gas Furnace provides 8...

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Goodman GR9T800804CX

Goodman 80% AFUE 80K BTU Furnace 9-Speed Low NOx 21"W Two Stage Upflow/Horizontal

SKU: GR9T800804CX
Product ID: 107461
$2,063.00
$2,063.00 - $2,063.00
$2,063.00
$1,547.00
$1,547.00 - $1,547.00
$1,547.00

Product Details Goodman 80% 80K BTU Gas Furnace Low NOx Two Stage 21"W Upflow/Horizontal GR9T800804CX The Goodman GR9T800804CX Low NOx Gas Furnace...

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Goodman GR9T800803BX

Goodman 80% AFUE 80K BTU Furnace 9-Speed Low NOx 17.5"W Two Stage Upflow/Horizontal

SKU: GR9T800803BX
Product ID: 107457
$1,949.00
$1,949.00 - $1,949.00
$1,949.00
$1,462.00
$1,462.00 - $1,462.00
$1,462.00

Product Details Goodman R32 80% AFUE Gas Furnace 80K BTU 17.5"W Two Stage Low NOx Upflow The Goodman 80% AFUE R32 2-Stage Gas Furnace provides 80,...

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Goodman GR9T801005CN

Goodman 80% 100K BTU Gas Furnace 9-Speed 21"W Two Stage Upflow/Horizontal

SKU: GR9T801005CN
Product ID: 107466
$2,205.00
$2,205.00 - $2,205.00
$2,205.00
$1,654.00
$1,654.00 - $1,654.00
$1,654.00

Product Details Goodman 80% AFUE 100K BTU Gas Furnace 2-Stage 21"W Upflow/Horizontal R32 GR9T801005CN The Goodman 80% AFUE R32 2-Stage Gas Furnace...

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Goodman GR9T800805CN

Goodman 80% AFUE 80K BTU Furnace 9-Speed 21"W Two Stage Upflow/Horizontal

SKU: GR9T800805CN
Product ID: 107462
$2,088.00
$2,088.00 - $2,088.00
$2,088.00
$1,566.00
$1,566.00 - $1,566.00
$1,566.00

Product Details Goodman 80% AFUE 80K BTU Gas Furnace Two-Stage 21"W Upflow/Horizontal R32 GR9T800805CN The Goodman 80% AFUE R32 2-Stage Gas Furnac...

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Goodman GR9T800804CN

Goodman 80% AFUE 80K BTU Furnace 9-Speed 21"W Two Stage Upflow/Horizontal

SKU: GR9T800804CN
Product ID: 107460
$2,063.00
$2,063.00 - $2,063.00
$2,063.00
$1,547.00
$1,547.00 - $1,547.00
$1,547.00

Product Details Goodman 80% 80K BTU Gas Furnace Two Stage 21" Width Upflow/Horizontal R32 GR9T800804CN The Goodman GR9T800804CN gas furnace is bui...

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Goodman GR9T800603AN

Goodman 80% 60K BTU Gas Furnace 14" Cabinet Two Stage Upflow/Horizontal

SKU: GR9T800603AN
Product ID: 107452
$1,863.00
$1,863.00 - $1,863.00
$1,863.00
$1,397.00
$1,397.00 - $1,397.00
$1,397.00

Product Details Goodman 60,000 BTU 80% Gas Furnace Two-Stage 9-Speed 14" Upflow/Horizontal R32 GR9T800603AN The Goodman GR9T800603AN gas furnace d...

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Goodman GR9T800603AX

Goodman 80% AFUE 60K BTU Furnace 9-Speed Low NOx 14"W Two Stage Upflow/Horizontal

SKU: GR9T800603AX
Product ID: 107453
$1,863.00
$1,863.00 - $1,863.00
$1,863.00
$1,397.00
$1,397.00 - $1,397.00
$1,397.00

Product Details Goodman R32 80% AFUE Gas Furnace 60K BTU 2-Stage Low NOx Upflow/Horizontal The Goodman 80% AFUE R32 2-Stage Gas Furnace provides 6...

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Goodman GR9T800403AX

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

SKU: GR9T800403AX
Product ID: 107451
$1,757.00
$1,757.00 - $1,757.00
$1,757.00
$1,318.00
$1,318.00 - $1,318.00
$1,318.00

Product Details Goodman R32 80% AFUE Gas Furnace 40K BTU Two-Stage Low NOx Upflow/Horizontal The Goodman 80% AFUE R32 2-Stage Gas Furnace provides...

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Goodman GR9T800403AN

Goodman 80% AFUE 40K BTU Furnace 9-Speed 14"W Two Stage Upflow/Horizontal

SKU: GR9T800403AN
Product ID: 107449
$1,757.00
$1,757.00 - $1,757.00
$1,757.00
$1,318.00
$1,318.00 - $1,318.00
$1,318.00

Product Details Goodman 80% 40,000 BTU Gas Furnace Two Stage 9 Speed 14" Upflow/Horizontal GR9T800403AN The Goodman GR9T800403AN Gas Furnace deliv...

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Goodman GR9S801205DN

Goodman 80% 120K BTU Furnace 9-Speed 24.5"W Single Stage Upflow/Horizontal

SKU: GR9S801205DN
Product ID: 107430
$2,312.00
$2,312.00 - $2,312.00
$2,312.00
$1,734.00
$1,734.00 - $1,734.00
$1,734.00

Product Details Goodman R32 80% AFUE Gas Furnace 120K BTU 24.5"W 2000 CFM Upflow/Horizontal The Goodman 80% AFUE R32 Gas Furnace delivers 120,000 ...

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Goodman GR9S801005CX

Goodman 80% 100K BTU Gas Furnace 9-Speed Low NOx 21"W Single Stage Upflow/Horizontal

SKU: GR9S801005CX
Product ID: 107429
$2,105.00
$2,105.00 - $2,105.00
$2,105.00
$1,579.00
$1,579.00 - $1,579.00
$1,579.00

Product Details Goodman 80% 100K BTU Gas Furnace Single Stage Low NOx Upflow/Horizontal R32 GR9S801005CX The Goodman GR9S801005CX 80% AFUE R32 Gas...

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Goodman GR9S800805CX

Goodman 80% 80K BTU Gas Furnace 9-Speed Low NOx 21"W Single Stage Upflow/Horizontal

SKU: GR9S800805CX
Product ID: 107427
$1,933.00
$1,933.00 - $1,933.00
$1,933.00
$1,450.00
$1,450.00 - $1,450.00
$1,450.00

Product Details Goodman 80% 80K BTU Gas Furnace Low NOx Single Stage 21"W Upflow/Horizontal GR9S800805CX The Goodman GR9S800805CX 80% AFUE R32 Ga...

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Goodman GR9S800804CX

Goodman 80% 80K BTU Gas Furnace 9-Speed Low NOx 21"W Single Stage Upflow/Horizontal

SKU: GR9S800804CX
Product ID: 107424
$1,864.00
$1,864.00 - $1,864.00
$1,864.00
$1,398.00
$1,398.00 - $1,398.00
$1,398.00

Product Details Goodman 80% 80,000 BTU Gas Furnace Low NOx 21"Width Upflow/Horizontal GR9S800804CX The Goodman GR9S800804CX is an 80,000 BTU, 80% ...

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Goodman GR9S800604BX

Goodman 80% 60K BTU Gas Furnace 9-Speed Low NOx 17.5"W Single Stage Upflow/Horizontal

SKU: GR9S800604BX
Product ID: 107415
$1,691.00
$1,691.00 - $1,691.00
$1,691.00
$1,268.00
$1,268.00 - $1,268.00
$1,268.00

Product Details Goodman 80% 60K BTU Gas Furnace Low NOx 17.5" Width Upflow/Horizontal GR9S800604BX The Goodman GR9S800604BX is a high-efficiency g...

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Goodman GR9S800603BX

Goodman 80% 60K BTU Gas Furnace 9-Speed Low NOx 17.5"W Single Stage Upflow/Horizontal

SKU: GR9S800603BX
Product ID: 107411
$1,667.00
$1,667.00 - $1,667.00
$1,667.00
$1,250.00
$1,250.00 - $1,250.00
$1,250.00

Product Details Goodman R32 80% AFUE Gas Furnace 60K BTU 17.5"W Low NOx Upflow/Horizontal GR9S800603BX The Goodman GR9S800603BX Low NOx gas furnac...

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Goodman GR9S800603BN

Goodman 80% 60K BTU Furnace 9-Speed 17.5"W Single Stage Upflow/Horizontal

SKU: GR9S800603BN
Product ID: 107409
$1,652.00
$1,652.00 - $1,652.00
$1,652.00
$1,239.00
$1,239.00 - $1,239.00
$1,239.00

Product Details Goodman 60,000 BTU 80% Gas Furnace 9 Speed Single Stage 17.5"W Upflow R32 GR9S800603BN The Goodman GR9S800603BN 60,000 BTU Gas Fur...

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Goodman GR9S800403AX

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

SKU: GR9S800403AX
Product ID: 107402
$1,539.00
$1,539.00 - $1,539.00
$1,539.00
$1,154.00
$1,154.00 - $1,154.00
$1,154.00

Product Details Goodman 80% AFUE 40K BTU Gas Furnace 14" Wide R32 Low NOx Upflow/Horizontal GR9S800403AX The Goodman GR9S800403AX Low NOx gas furn...

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Goodman GR9T960403AN

Goodman 96% 40K BTU Gas Furnace 9-Speed 14"W Two Stage Upflow/Horizontal

SKU: GR9T960403AN
Product ID: 107470
$2,503.00
$2,503.00 - $2,503.00
$2,503.00
$1,877.00
$1,877.00 - $1,877.00
$1,877.00

Product Details Goodman 96% AFUE 40,000 BTU Gas Furnace Two-Stage Upflow/Horizontal R32 GR9T960403AN The Goodman GR9T960403AN is a compact, high-e...

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Goodman GR9S960804CN

Goodman 96% AFUE 80K BTU Gas Furnace 21" Cabinet 9-Speed Upflow/Horizontal

SKU: GR9S960804CN
Product ID: 107444
$2,917.00
$2,917.00 - $2,917.00
$2,917.00
$2,188.00
$2,188.00 - $2,188.00
$2,188.00

Product Details Goodman 96% AFUE 80K BTU Gas Furnace 9-Speed Single Stage Upflow/Horizontal GR9S960804CN The Goodman GR9S960804CN Gas Furnace offe...

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Goodman GR9S920804CN

Goodman 92% AFUE 80K BTU Gas Furnace 21" Cabinet 9-Speed Upflow/Horizontal

SKU: GR9S920804CN
Product ID: 107434
$2,613.00
$2,613.00 - $2,613.00
$2,613.00
$1,960.00
$1,960.00 - $1,960.00
$1,960.00

Product Details Goodman 92% AFUE 80K BTU Gas Furnace 9-Speed Single Stage Upflow/Horizontal GR9S920804CN The Goodman GR9S920804CN is a dependable,...

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An upflow furnace draws return air in through the bottom of the cabinet and pushes heated air out the top, which makes it the right orientation for the most common furnace location in American housing: a basement or a first-floor closet with the supply ducts running overhead. Every furnace in this collection also converts to horizontal for an attic or crawlspace install, so the same unit covers the two layouts that account for the large majority of homes. Downflow is the exception, for furnaces that sit above the living space and feed ducts below.

Capacity is the first decision and this page is organized around it, with sub-collections from 30,000 to 120,000 BTU. Efficiency is the second, from 80 percent AFUE with metal venting to 96 and 97 percent condensing models vented in PVC. If you are pairing the furnace with a heat pump for dual-fuel operation, our ACiQ gas furnace and heat pump systems bundle the two, and our upflow versus downflow furnace guide explains how to read your ductwork before you choose.

Why Choose Upflow Furnaces from HVAC Store?

  • We stock every residential capacity from 30,000 to 120,000 BTU across 80, 92, 96 and 97 percent AFUE tiers.

  • Orders over $1,000 ship free to the 48 contiguous states, and most states outside California pay no sales tax.

  • Find the same furnace priced lower elsewhere and we will match it under our lowest price guarantee.

  • Our specialists confirm capacity, cabinet width and coil pairing before your order ships.

You Might Also Like

  • Furnaces - Every furnace we carry across upflow, downflow and multi-positional orientations.

  • 40,000 BTU Upflow Furnaces - The small-home capacity, for condos, cabins and additions on their own duct run.

  • 60,000 BTU Upflow Furnaces - The most popular residential size, with the widest choice of staging and efficiency.

  • Downflow Furnaces - The other orientation, for furnaces installed above the ducts they feed.

Best Upflow Furnaces for...

Small Homes and Additions

The best upflow furnace for a compact, well-insulated home is the smallest capacity that still runs long enough to keep the house even. The Goodman 96% 30K BTU Gas Furnace 9-Speed 14"W Two Stage Upflow/Horizontal starts the range.

Typical Three and Four Bedroom Homes

The best upflow gas furnace for the average family home is an 80,000 BTU high-efficiency unit. The Goodman 96% AFUE 80,000 BTU Gas Furnace 17.5"W Nine-Speed Upflow/Horizontal pairs with a 3 to 4 ton coil.

Large Homes in Cold Climates

The best furnace upflow for a large home in a northern climate is a two stage 100,000 BTU unit that runs on low most of the season. The Goodman 96% 100K BTU Gas Furnace 9-Speed 21"W Two Stage Upflow/Horizontal holds temperature without swings.

Quietest Operation and Humidity Control

The best upflow furnace for comfort is a variable speed unit paired with a matching air conditioner. The Goodman 96% AFUE 100K BTU Furnace Variable Speed 24.5"W Upflow/Horizontal modulates its blower for steady airflow and better dehumidification.

Quick Spec Comparison

Every furnace in this collection installs upflow or horizontal and runs on standard household voltage. Capacity, efficiency, staging and cabinet width are what separate them.

Application

Capacity Range

AFUE Available

Staging

Cabinet Width

Small homes and additions

30,000 to 40,000 BTU

80 to 96 percent

Single or two stage

14 or 17.5 inch

Typical three and four bedroom homes

60,000 to 80,000 BTU

80 to 97 percent

Single, two stage or variable speed

14 to 21 inch

Large homes in cold climates

100,000 BTU

80 to 97 percent

Single, two stage or variable speed

21 or 24.5 inch

Largest homes and light commercial

120,000 BTU

96 percent

Single or two stage

24.5 inch

FAQ

What is an upflow furnace?

An upflow furnace is a gas furnace built to take return air in at the bottom of the cabinet and discharge heated air out the top into a plenum and supply ducts above it. It is the standard configuration for basements, utility rooms and closets where the ductwork runs above. Every furnace on this page can also be laid on its side for horizontal installation.

What is the difference between upflow and downflow?

The difference is the direction air travels through the cabinet. Upflow pulls air in at the bottom and sends it out the top, for furnaces below the ducts; downflow pulls air in at the top and sends it out the bottom, for furnaces above the ducts, such as a closet feeding a slab home. The heat exchanger and blower are arranged differently, so the two are not interchangeable.

How do I know what size upflow furnace I need?

Size the furnace to the home's heat loss, which depends on square footage, insulation, window area, ceiling height and climate. As a rough guide, a 40,000 BTU furnace suits up to about 1,300 square feet, 60,000 BTU up to about 2,000, 80,000 BTU up to about 2,700, and 100,000 to 120,000 BTU for larger or colder homes. A load calculation from your installer turns that guide into a firm number.

Is a 96 percent upflow furnace worth the extra cost?

A 96 percent AFUE furnace is worth it in any climate with a real heating season, because it sends about 16 percent less fuel up the flue than an 80 percent unit and pays the difference back in a few winters. It also vents in PVC through a side wall rather than a metal chimney. In mild climates with short heating seasons the 80 percent furnace remains the sensible buy.

Can an upflow furnace be installed horizontally?

Yes, every furnace here is rated for both upflow and horizontal installation. In horizontal position the unit lies on its side in an attic or crawlspace, return air in one end and supply out the other. Horizontal installs need a drain pan beneath a condensing furnace, a platform rated for the weight, and clearance to service the burners, all spelled out in the installation manual on each product page.

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