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Trane
120,000 BTU Gas Furnace
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 24.5" Cabinet | S8X1D120M5PSC
$2,104.99
A 120,000 BTU gas furnace serves large homes with heavy heating demands, typically in colder regions. At this input, the installation details — venting, condensate, and gas supply — carry as much weight as the furnace itself, because everything scales up with the output.
14 products
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 24.5" Cabinet | S8X1D120M5PSC
Trane
Trane 80% AFUE, Two-Stage, Upflow/Downflow/Horizontal, 24.5" Cabinet | S8X2D120M5PSC
Trane
Trane 96% AFUE, Single-Stage, Upflow/Left/Right, 24.5" Cabinet | S9X1D120U5PSB
Trane
Trane 96% AFUE, Two-Stage, Upflow/Left/Right, 24.5" Cabinet | S9X2D120U5PSB
Trane
Trane 97% AFUE, Two-Stage Variable Speed, Upflow/Horizontal, 3-4 Ton Airflow, 24.5" Cabinet | S9V2D120U5VSB
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GR9S801205DN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GR9T801205DN
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GR9S921205DN
Goodman
Goodman Single-Stage, Downflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GD9S961205DN
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GR9S961205DN
Goodman
Goodman Two-Stage, Downflow/Horizontal, Variable-Speed ECM, Communicating, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GDVT961205DN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GR9T961205DN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Variable-Speed ECM, Communicating, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GRVT961205DN
Goodman
Goodman Modulating, Upflow/Horizontal, Variable-Speed ECM, Communicating, 120,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GRVM971205DN
A furnace this large moves a lot of fuel and air, so the supporting systems have to keep up. A high-efficiency condensing model vents through PVC and produces more condensate to drain; the gas line and meter must supply the higher input; and the ductwork and blower have to carry enough airflow to distribute the heat. Getting these right is what turns high BTU into even, efficient comfort.
Planning a 120,000 BTU furnace install? We'll help you check venting, gas, and airflow →
Large homes with high heat loss, usually in cold climates. Because this is a lot of output, a load calculation is important to avoid oversizing.
A high-efficiency condensing model vents through PVC and drains condensate, while an 80% model uses a metal flue. Either way, high input means the venting and (for condensing) the drain must be sized correctly.
Not always. High-input furnaces draw more gas, so the gas line and meter must be able to supply it. Confirm gas capacity before installing a large furnace.
Use a two-stage or modulating furnace so it isn't always at full blast, ensure the ductwork carries the airflow, and consider zoning so each area of the home gets the heat it needs.