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Trane
100,000 BTU Gas Furnace
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 21" Cabinet | S8X1C100M5PSC
$2,055.99
Gas furnaces heat by burning natural gas or propane and blowing warm air through your ducts. They're sized by heating output in BTU, from around 26,000 up to 125,000. Browse by BTU and compare efficiency and staging below.
185 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
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
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 5 Ton Airflow, 24.5" Cabinet | R801T1255A24UHSNA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Variable-Speed ECM, 5 Ton Airflow, 24.5" Cabinet | R801V1255A24UHSCA
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 14.5" Cabinet | S8X1A026M2PSC
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 14.5" Cabinet | S8X1A040M3PSC
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8X1B040M2PSC
Trane
Trane 80% AFUE, Two-Stage, Upflow/Downflow/Horizontal, 14.5" Cabinet | S8X2A040M3PSC
Trane
Trane 80% AFUE, Two-Stage Variable Speed, Upflow/Downflow/Horizontal, 14.5" Cabinet | S8V2A040M3PCB
Trane
Trane 96% AFUE, Single-Stage, Upflow/Left/Right, 17.5" Cabinet | S9X1B040U3PSB
Trane
Trane 96% AFUE, Two-Stage, Upflow/Left/Right, 17.5" Cabinet | S9X2B040U3PSB
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 3 Ton Airflow, 14" Cabinet | R801T0503A14UHSNA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Variable-Speed ECM, 3 Ton Airflow, 14" Cabinet | R801V0503A14UHSCA
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8X1B060M4PSC
Trane
Trane 80% AFUE, Two-Stage, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8X2B060M4PSC
Trane
Trane 80% AFUE, Two-Stage Variable Speed, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8V2B060M4PCB
Trane
Trane 96% AFUE, Single-Stage, Upflow/Left/Right, 17.5" Cabinet | S9X1B060U4PSB
Trane
Trane 96% AFUE, Two-Stage, Upflow/Left/Right, 17.5" Cabinet | S9X2B060U4PSB
Trane
Trane 97% AFUE, Two-Stage Variable Speed, Upflow/Horizontal, 1.5-2.5 Ton Airflow, 17.5" Cabinet | S9V2B060U3VSB
Trane
Trane 97% AFUE, Two-Stage Variable Speed, Upflow/Horizontal, 2-3 Ton Airflow, 17.5" Cabinet | S9V2B060U4VSB
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 3.5 Ton Airflow, 17.5" Cabinet | R801T0754A17UHSNA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Constant-Torque ECM, 4 Ton Airflow, 21" Cabinet | R801T0754A21UHSNA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Variable-Speed ECM, 4 Ton Airflow, 17.5" Cabinet | R801V0754A17UHSCA
Ruud
Ruud 80% AFUE, Upflow/Horizontal, Variable-Speed ECM, 5 Ton Airflow, 21" Cabinet | R801V0755A21UHSCA
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8X1B080M4PSC
Trane
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 21" Cabinet | S8X1C080M5PSC
Trane
Trane 80% AFUE, Two-Stage, Upflow/Downflow/Horizontal, 17.5" Cabinet | S8X2B080M4PSC
Start with the BTU output your home's heat loss requires, then choose efficiency (80% vs 90%+ AFUE) and burner staging (single, two-stage, or modulating). A high-efficiency condensing furnace costs more and vents through PVC, but burns less gas every winter.
Have a question about the right fit for your setup? Reach out and we'll help →
Match the output to your home's heat loss, which depends on climate, insulation, and size. A heating load calculation is accurate; a rough guide is 30–60 BTU per square foot depending on region.
Gas furnaces run on natural gas, and most can be converted to propane with a kit. Choose based on the fuel available at your home.