TSTATG4273 Control up to 4 Heat & 2 Cool Stages Adjustable 2nd, 3rd & 4th Stage Timers & Deadbands Dual-Fuel Capable Outdoor Sensor Ready with High/Low Readouts for the Day Compatible with Comfort Alert™ Equipped with Humidity Module: Controls Humidification, Dehumidification & Reheat Programmable Output for Ventilation, Lighting, Comfort Alert, and more Remote Sensor Ready TSTATG4272 Control up to 4 Heat & 2 Cool Stages Adjustable 2nd, 3rd & 4th Stage Timers & Deadbands Outdoor Sensor Ready with High/Low Readouts for the Day Remote Sensor Ready TSTATG2111-2 Control up to 2 Heat & 1 Cool Stages Outdoor Sensor Ready