iO Universal Twinning/Paralleling Kit

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Item #: iO-TWIN
Alternate Item #: TK-400

The twinning kit is designed to allow a single thermostat to control two separate HVAC units. This twinning kit can also be expanded to control a total of four HVAC units. The iO-TWIN can be used on common or separated ducted systems with single-stage, multi-stage and heat pump equipment. Only standard 18 gauge thermostat wire is required. Thermostats and HVAC units can be located up to 300' from the panel.

Features and Benefits
  • Easy to install and setup
  • Uses standard 18 gauge thermostat wire
  • Optional control of up to 4 units
  • Reduces installation time
  • 5-year warranty
Product Specifications
6.00” x 8.00” X 1.50” (WHD)
Input Voltage
Aluminum back plate with mounting holes


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Universal Twinning Kit
Universal Twinning Kit