iO HVAC Controls iO-TWIN Universal Twinning KitiO HVAC Controls iO TWIN Universal Twinning Kit Description The Twinning Kit is designed to allow a single thermostat to control two identical HVAC units. It can also be expanded to control a total of four HVAC units. The iO TWIN can be used on common or separate ducted systems with single stage, multi stage or heat pump equipment. Only standard 18 gauge thermostat wire is required. Thermostats and HVAC units can be located up to 300 from the twinning
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