Century Furnace Manuals
Select your Century model number below for installation steps, settings, maintenance schedules, troubleshooting and the full specification sheet. Your model number is printed on the rating plate.
Century furnaces by model number
| Model | Description | Certified |
|---|---|---|
| GDD96C045B3MP | 96% AFUE gas furnace | September 2026 |
| GDD96C070B4MP | 96% AFUE gas furnace | September 2026 |
| GDD96C090C4MP | 96% AFUE gas furnace | September 2026 |
| GDD96C110C5MP | 96% AFUE gas furnace | May 2026 |
| GUH96C045B3MP | 96% AFUE gas furnace | September 2026 |
| GUH96C070B3MP | 96% AFUE gas furnace | September 2026 |
| GUH96C090C4MP | 96% AFUE gas furnace | September 2026 |
| GUH96C110C5MP | 96% AFUE gas furnace | September 2026 |
| GUH96C135D5MP | 96% AFUE gas furnace | February 2026 |
| GUH97T045B3MP97G2UH045BV12-** | 97% AFUE gas furnace | April 2026 |
| GUH97T070B3MP97G2UH070BV12-** | 97% AFUE gas furnace | April 2026 |
| GUH97T090C3MP97G2UH090CV12-** | 97% AFUE gas furnace | April 2026 |
| GUH97T090C5MP97G2UH090CV20-** | 97% AFUE gas furnace | March 2026 |
| GUH97T110C5MP97G2UH110CV20-** | 97% AFUE gas furnace | April 2026 |
| GUH97T135D5MP97G2UH135DV20-** | 97% AFUE gas furnace | April 2026 |