The Omnistat 2 RC-2000 by HAI is the latest generation of programmable communicating thermostats and provide precise digital temperature control over your HVAC system. What makes Omnistat2 thermostats stand abouve their competition is that they use advanced digital technology to learn the hearing cooling of your home to control the equipment for maximum efficiency and comfort. Omnistat2 thermostats have an automatic heat cool changeover, which features an automatic switch from heating to cooling mode and back without any manual operation. The fan cycle mode periodically ciruclates air for comofrt. To adjust temperature settings, simply turn the scroll whell to the right or left. Omnistat2 thermostats do not require batteries to retain their settings and time. The RC-2000 has all the benefits of the RC-1000 plus a multi-stage heat pump, a multi-state heat conventional, humidification and dehumidification.