Depending on how extensive the repair is, GE Home Services LLC' average time to repair the furnace is 1-3 hours. However, various factors such as size play an important role in determining the time. For example- Larger and more complex furnaces take longer than smaller and basic ones. Numerous factors determine the overall time taken for repairing the furnace, such as: Type and model of the furnace How well the system is maintained Whether the technicians can fix the part through repair or if it needs to be replaced