Goodman 40,000 BTU Gas Furnace 80% AFUE Single-Stage, 14" Wide, Upflow/Horizontal

Yes. Goodman is one of the most trusted names in residential HVAC, engineered and assembled in the USA with heavy duty aluminized steel heat exchangers and advanced diagnostic controls. Goodman heating equipment delivers exceptional long term reliability at competitive wholesale costs. To browse our inventory of reliable heating equipment, explore our full goodman gas furnaces collection.

80% AFUE Standard Efficiency: Uses traditional metal chimney venting. It offers lower upfront equipment costs and simple installation when replacing an older standard furnace. Check out our goodman 80% efficiency furnaces for cost effective replacements.

96% AFUE High Efficiency: Uses secondary condensing heat exchangers to extract heat from exhaust gases, venting through PVC pipe. These high efficiency models convert up to 96% of fuel into heat to minimize winter gas bills. Explore our goodman 96% efficiency furnaces for maximum energy savings.

Furnace heating capacity is measured in British Thermal Units (BTU). Selecting the proper BTU size ensures proper air distribution and prevents short cycling. Depending on square footage, layout, and climate zone:

• Compact Homes or Additions (up to 1,000 sq. ft.): Explore our 40,000 BTU furnaces.
• Mid-Sized Homes (1,000 to 1,500 sq. ft.): View our 60,000 BTU furnaces and 80,000 BTU furnaces.
• Full-Sized & Multi-Story Homes (1,500 to 2,500+ sq. ft.): Look at our heavy duty 100,000 BTU furnaces or 120,000 BTU furnaces.

Yes. Most standard residential Goodman natural gas furnaces can easily be converted for liquid propane (LP) operation. If your home relies on a propane tank, simply purchase a brand matching liquid propane conversion kit from our installation accessories when placing your order.

Single stage units run at 100% full heating power whenever the thermostat calls for heat. A two stage Goodman furnace operates at a lower 65% capacity on milder winter days and automatically ramps up to 100% capacity during cold snaps. This results in quieter operation, more even indoor temperatures, and reduced energy usage throughout the heating season.

Yes. A Goodman gas furnace serves as the primary air handler to circulate cold air during the summer months. You can pair a furnace with a central AC condenser in our matched ac and furnace systems or pair it with an outdoor heat pump in our dual fuel heat pump and furnace systems.