When a staged system of single-speed fans is used to ventilate a livestock barn, the control system must automatically cycle fans on and off to achieve temperature control within the barn. In the past, conventional electro-mechanical thermostats have been used. When several stages of ventilation are needed, and when heaters also must be controlled, the operator needs to set several thermostats within an individual room. Integrated fan-heater sequencers offer the potential to replace staged thermostat systems with a single controller whose operation is adjusted by a single setpoint. The higher cost of the sequencers must be offset by user convenience. Integrated fan-heater sequencers should only be installed if quick on-farm repair service can be guaranteed.