Goodman 80% AFUE Gas Furnaces

Reliable heat, built to last. This collection features Goodman 80% AFUE gas furnaces designed for straightforward, budget-friendly comfort. These units deliver consistent warmth, durable performance, and simple serviceability — a solid choice for garages, shops, add-ons, and homes in milder climates where high-efficiency equipment isn’t required. Browse models by BTU output and configuration to match the heating needs of your space. All units are backed by Goodman’s well-known warranty support and proven engineering. 

Why Choose a Goodman 80 AFUE Gas Furnace?

With an AFUE rating of 80%, 80 cents' worth of fuel burned will be turned into useful heat. Goodman gas furnaces are perfect for markets where high-efficiency gas furnaces are not required. Goodman 80% AFUE gas furnaces are designed for extended use with minimal maintenance in a range of residential and light commercial frameworks. Browse the full selection of gas furnace Goodman models below to find the right fit for your space.

Choose this product line for:

• Single Stage & Two Stage Options—Single-stage gas furnaces are simple to use, while two-stage furnaces provide enhanced comfort and more controllable heating.
• Upflow & Downflow Options — Available in several airflow orientations to match existing ductwork.
• 40,000 to 120,000 BTU Strength—Models available for whole home heating as well as specialized heating for smaller areas.
• Long-Lasting Aluminized Steel Heat Exchanger — Built to resist corrosion.
• Customer Satisfaction — Designed to provide easy service and reduce repair times.

Upflow vs. Downflow — Which Configuration Do You Need?

The most suitable configuration must be selected during the installation. Upflow installations will pull return air from the bottom and discharge heated air from the top. These are often found in basements or utility closets with ductwork above. Downflow installations will pull air from the top and push air down, and these are more suitable for attics and spaces above living areas where ductwork resides underneath.

Unsure which gas furnace Goodman model will fit into your system? Let us help you find the right match.

Choosing the Right BTU Output

Choosing the proper size The Goodman 80% AFUE gas furnace helps the furnace last longer and run more efficiently. An undersized furnace will run all the time and will not reach the desired temperature. An oversized furnace will run for a short time, making the furnace wear out faster. This chart can help calculate the proper size Goodman furnace.

• 40,000 – 60,000 BTU – Recommended for smaller homes, apartments, or buildings with a single zone and less than 1,200 sq ft.
• 60,000 – 80,000 BTU – Mid-size homes and buildings that are in the 1,200 to 2,000 sq ft range and are well insulated.
• 80,000 – 100,000 BTU – Good for larger homes and those with higher heat loss in the 2,000 to 2,800 sq ft range.
• 100,000 – 120,000 BTU – Larger homes, buildings with large open floor plans, and those in colder regions (2,800+ sq ft)
• For the most accurate calculation of air conditioning load, you should contact an HVAC professional.

Shop Goodman 80% AFUE Gas Furnaces at AC Units For Less

Being an authorized Goodman dealer, we offer Goodman gas furnaces for every heating need, from small single-zone systems to large, whole-house gas furnaces. Each Goodman 80 AFUE gas furnace of the available selection is designed for a variety of residential and light-commercial use. Please browse the selection to choose the desired BTU, type, and number of stages.

Browse Goodman 80% AFUE Gas Furnaces:

• Goodman GR9S800603AN 80% AFUE Gas Furnace
• Goodman GR9S800403AN 80% AFUE Gas Furnace
• Goodman GR9T800803BN 80% AFUE Gas Furnace
• Goodman GR9S800803BN 80% AFUE Gas Furnace