Simplified zoning kit designed for independent temperature control in electronic direct-expansion air conditioning equipment using ducts. Control over up to 6 independent zones. Air conditioning ON/OFF control. The air conditioner’s original controller is to be retained. Summer/winter changeover in the conditioner’s controller and in the master thermostat. Radio-controlled digital thermostats with timing in 30 minute intervals. Coded radio-controlled transmission system (over 3000 combinations).