Cannot think how I missed your reply! Thanks and sorry! Occupancy sensing is primarily but not only by light. Movement sensing is not used, in part because i

Cannot think how I missed your reply! Thanks and sorry! Occupancy sensing is primarily but not only by light. Movement sensing is not used, in part because it would likely not work well from the common low-to-floor positioning of radiator valves, often obstructed by furniture. Sound is not currently used. You can get a good idea of the tech underpinnings at the open-source site, though there is significant secret sauce on top for the commercial product: https://github.com/opentrv/ https://github.com/opentrv/ Radbot effectively contains an internal physics model to work out what is going on further into to room. A simple low-pass filter that can be engaged when needed is a big part of that in practice! Our driving goal is cutting carbon emissions, which goes hand-in-glove with reduction in energy use and also bills. The target for this product is 30% reduction in space heat demand, carbon and £££s.