10/17/2026
A thermostat measures the air it sits in. It cannot see that the balcony door is open. That gap is where cooling budgets leak.
One ceiling-mounted 9-in-1 sensor closes it: an addressable 2-zone dry contact takes the window sensor, the built-in temperature input pairs to the HVAC2 module, and the room interlocks as soon as the door opens.
Motion, lux and 32 logic lines ride the same bus loop. One ceiling point, no extra wiring.
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