This application guide describes the integration of Fujitsu AIRSTAGE indoor units with compatible smart thermostats using the Airzone Aidoo Pro as a smart control and communication interface. In addition to enabling standard smart thermostat control, this integration supports utility demand response (DR) programs when used with demand-response-compliant thermostats such as Google Nest and ecobee.

How the Aidoo Pro Enables Demand Response Compliance

The Airzone Aidoo Pro resolves this incompatibility by acting as an intelligent protocol gateway between the smart thermostat ecosystem and the Fujitsu AIRSTAGE indoor unit. When paired with a demand-response-compliant thermostat such as Google Nest or ecobee, the Aidoo Pro allows the thermostat’s demand signals—including those generated during a utility demand response event—to be translated into native Fujitsu AIRSTAGE digital commands.

This architecture enables demand response compliance by:

•Allowing the smart thermostat to remain the controlling endpoint required by utilities and DR program administrators
•Translating thermostat-driven demand adjustments into Fujitsu AIRSTAGE-approved operating commands
•Preserving inverter modulation, safety logic, and fault handling during DR events
•Avoiding simple relay-based or forced shutdown strategies that can negatively impact comfort, efficiency, and equipment longevity

As a result, Fujitsu AIRSTAGE indoor units connected through the Aidoo Pro can participate in demand response programs indirectly but effectively, using approved smart thermostat platforms without compromising system performance or design intent.