"Ecobee3 as a higher-value alternative, thanks to remote-sensor compatibility that lets homeowners adjust the temperature for individual rooms."
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The sensor can't adjust temperature it will just measure it. The system requires control over the heat/cold source in order to be able to adjust the temperature individually. In a forced air heated home the only way to control individual room temperatures is by controlling the floor vent. So one needs to budget that too (and it's probably more expensive than the sensor).