Preorders have already shipped, but now, you can buy the Temperature Sensor directly
Nest’s Temperature Sensor was announced back in March and preorders started shipping last month, but now it’s finally available to buy outright, via Android Police.
Each sensor costs $39, or you can pick up a three-pack for $99 for people who actually own houses large enough to need that many independently temperature-monitored rooms. (I live in an apartment, so it’s a little hard for me to imagine that kind of luxury.)
To use the Temperature Sensor, you’ll need either the latest-generation Nest Learning Thermostat or the Nest Thermostat E. (It’s not compatible with older first-gen or second-gen Nest thermostats.) You’ll also need the latest version of the Nest app. While the Temperature Sensors don’t offer complete room-by-room control, they do make it easier to control your house’s heating based on other rooms that don’t have a thermostat.