Goodman R-32 Downflow Gas Furnace & AC Systems

A downflow system pushes air down into ducts below the furnace. It is common in homes built on a slab, in hallway closets and on upper floors. Each kit pairs a Goodman GD downflow furnace with a cased coil installed beneath it.

Every system is AHRI-matched and includes three Goodman components: an R-32 air conditioner condenser (GLXS3, GLXS4 or GLXS5), a gas furnace, and a matching cased evaporator coil.

Choose from 463 systems in 1.5 to 5 ton, with furnaces from 40,000 to 100,000 BTU and cooling efficiency of 13.4 to 15.2 SEER2.

Upflow, horizontal or downflow?

• Upflow: the furnace sits in a basement or closet and pushes air up into ducts above it.
• Horizontal: the furnace lies on its side in an attic or crawlspace, with air moving sideways.
• Downflow: the furnace sits in a closet or upper floor and pushes air down into ducts under the floor, common in homes on a slab.

Match the system to the way your current furnace is installed.

Read the furnace model number

Example: GR9S800603BN

• GR = upflow/horizontal, GD = downflow/horizontal
• 9S = single-stage, 9T = two-stage
• 80 / 92 / 96 = AFUE efficiency
• 060 = 60,000 BTU input
• B = cabinet width (A 14", B 17.5", C 21", D 24.5")

Frequently asked questions

Do I need a downflow subbase?

If the furnace sits on a combustible floor, a downflow subbase (sold separately) is usually required. Check the installation manual and local code.

Is there a 92% downflow system?

No. Goodman's 92% AFUE furnace is upflow/horizontal only. For downflow, choose 80% or 96% AFUE.

What refrigerant do these systems use?

R-32. Replace the outdoor unit and the indoor coil together; an R-32 condenser cannot run with an old R-410A or R-22 coil.

Does SEER2 depend on the furnace and coil?

Yes. The SEER2 rating belongs to the exact AHRI-matched combination of condenser, coil and furnace, which is why the same condenser can show different ratings.

Can I use propane?

These furnaces ship set up for natural gas. Most can be converted to propane (LP) with a Goodman conversion kit, sold separately.

Do you ship gas systems?

Yes, to all 48 contiguous states. Licensed contractors can get trade pricing through our contractor portal.

Shop Goodman R-32 gas systems

By installation: Upflow · Horizontal · Downflow

By size: 1.5 Ton · 2 Ton · 2.5 Ton · 3 Ton · 3.5 Ton · 4 Ton · 5 Ton

By furnace efficiency: 80% AFUE · 92% AFUE · 96% AFUE

By furnace stage: Single-stage · Two-stage