Suited for use with commercial HVAC systems, Siemens RDY2000 can interface with ventilation systems, economizers, and humidification systems to optimize indoor comfort as well as minimize energy consumption. Solution offers 3 stage heating/3 stage cooling control for conventional systems and 1–2 compressors/2 stage auxiliary heat control for heat pump systems. Features include temperature and humidity sensors, backlit 5 in. LCD touchscreen, and programmable scheduling.