It is a good thought if kept to the lighting systems that RDM was designed for. There are a few applications that could also use RDM for gathering sensor data, but I would not go beyond that. For example, the HVAC of a home could use RDM to gather data from temperature sensors, but I would not use RDM to control a furnace. What I would suggest is using a dry contact or other means to signal the HVAC system, and let their controls do the rest.
Javid
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