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Trane
100,000 BTU Gas Furnace
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 21" Cabinet | S8X1C100M5PSC
$2,055.99
A 100,000 BTU gas furnace is built for large homes and cold climates with a serious heating demand. At this output, how the furnace delivers heat — its staging and whether the home is zoned — matters as much as the raw BTU, because a big single-stage burner can overwhelm smaller areas.
33 products
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 21" Cabinet | S8X1C100M5PSC
Trane
Trane 80% AFUE, Two-Stage, Upflow/Downflow/Horizontal, 21" Cabinet | S8X2C100M5PSC
Trane
Trane 80% AFUE, Two-Stage Variable Speed, Upflow/Downflow/Horizontal, 21" Cabinet | S8V2C100M5PCB
Trane
Trane 96% AFUE, Single-Stage, Upflow/Left/Right, 21" Cabinet | S9X1C100U5PSB
Trane
Trane 96% AFUE, Two-Stage, Upflow/Left/Right, 21" Cabinet | S9X2C100U5PSB
Trane
Trane 97% AFUE, Two-Stage Variable Speed, Upflow/Horizontal, 2-3 Ton Airflow, 21" Cabinet | S9V2C100U4VSB
Trane
Trane 97% AFUE, Two-Stage Variable Speed, Upflow/Horizontal, 3-4 Ton Airflow, 21" Cabinet | S9V2C100U5VSB
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 4.5 Ton Airflow, 21" Cabinet, Manufactured Housing | R801TA100521MSA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 4.5 Ton Airflow, 21" Cabinet | R801T1005A21UHSNA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Variable-Speed ECM, 5 Ton Airflow, 21" Cabinet | R801V1005A21UHSCA
Goodman
Goodman Single-Stage, Downflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GD9S801005CN
Goodman
Goodman Single-Stage, Downflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GD9S801005CX
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GR9S801005CN
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GR9S801005CX
Goodman
Goodman Two-Stage, Downflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GD9T801005CX
Goodman
Goodman Two-Stage, Downflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GDVT801005CX
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 4 Ton Airflow, 21" Cabinet | GR9T801004CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GR9T801005CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GR9T801005CX
Goodman
Goodman Two-Stage, Upflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GRVT801005CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet, Low-NOx | GRVT801005CX
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 4 Ton Airflow, 21" Cabinet | GR9S921004CN
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GR9S921005CN
Goodman
Goodman Single-Stage, Downflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GD9S961005CN
Goodman
Goodman Single-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GR9S961005CN
Goodman
Goodman Two-Stage, Downflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GD9T961005CN
Goodman
Goodman Two-Stage, Downflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GDVT961005CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 4 Ton Airflow, 21" Cabinet | GR9T961004CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Multi-Speed ECM, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GR9T961005CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GRVT961005CN
Goodman
Goodman Two-Stage, Upflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 24.5" Cabinet | GRVT961005DN
Goodman
Goodman Modulating, Downflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GDVM971005CN
Goodman
Goodman Modulating, Upflow/Horizontal, Variable-Speed ECM, Communicating, 100,000 BTU, 5 Ton Airflow, 21" Cabinet | GRVM971005CN
A large furnace that only runs full-blast can overheat some rooms while the thermostat's zone catches up, then shut off. Two-stage or modulating burners let a 100,000 BTU furnace run gentler most of the time and ramp up only in deep cold, which keeps a big house even. Pair that with adequate ductwork and, in many large homes, zoning so each area gets the right amount of heat.
Heating a large or cold-climate home? We'll help you spec staging, airflow, and zoning →
Large homes, or homes in cold climates with high heat loss. A load calculation confirms whether this output matches your home rather than oversizing it.
A large single-stage burner delivers all its heat at once, which can overheat parts of a big house and cause short cycling. Two-stage or modulating burners spread that output more evenly and comfortably.
Often, yes. Zoning uses dampers and multiple thermostats so different areas get the heat they need — valuable in large or multi-story homes where a single thermostat can't keep everything even.
Higher input furnaces draw more gas, so the gas line and meter must be able to supply it. Confirm the gas capacity when moving up to a large furnace.