AFUE typical bands by system type
Typical AFUE bands by system type — labeled typicals for planning, not a manufacturer spec sheet. Use the exact AFUE from your unit's nameplate or quote in the furnace-cost and AFUE-savings tools.
| System type | Typical AFUE |
|---|---|
| Old / non-condensing gas | 0.56–0.70 |
| Standard gas | 0.80–0.83 |
| Condensing gas | 0.90–0.98 |
| Oil furnace | 0.80–0.90 |
| Electric resistance | 1.00 |
Labeled typicals for planning — use the exact AFUE from your unit's nameplate or quote.