Furnace Twinning Kits:

From time to time you may need to make furnaces work in tandem with each other. The best way to to do this is to use the furnace boards "Twin" terminal if it has one. The twin terminal then will make sure both fan motors are energized at the same time. IF your furnace board does not have this feature, then consider the twinning kit below....Documentation is attached...

IO Twin Kit:

The twinning kit is designed to allow a single thermostat to control two separate HVAC units. It can also be expanded to control a total of four HVAC units. The twinning kit can be used on common or separate 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 twinning kit panel.

Specifications:
Mounting: Aluminum back plate with mounting holes
Dimensions: 8” Height x 6” Width x 1.5” Depth
Input Voltage: 24VAC

Warranty: 5-year