A standard air conditioner is designed for human comfort. It cycles on and off, tolerates temperature variation of several degrees, has little to no humidity control capability, and is not designed for continuous operation. A CRAC unit is engineered for electronics: it maintains temperature to within +/-1°C of setpoint, actively controls relative humidity, operates continuously without degradation, and is designed with a high sensible heat ratio to efficiently remove the dry heat produced by IT equipment. According to TechTarget, CRAC units are generally more efficient than standard air conditioning systems for data centre applications.