Google’s Nest thermostats are smart, but they only read the temperature in the hallway where they’re installed. The three-pack of Nest Temperature Sensors fixes that. It lets your thermostat manage your home based on the rooms you actually use.

Each small, white sensor communicates wirelessly with compatible Nest Learning and Nest Thermostat E models. Place one in the always-chilly bedroom, another in the sun-drenched living room, and a third in the home office. You then tell your thermostat which sensor to prioritize during specific times in your schedule. Your system will run until that particular room reaches your desired comfort, balancing temperatures throughout the house.

The setup is straightforward in the Nest app. Battery life is solid, lasting about two years per sensor. Just know that these sensors only report temperature; they don’t measure humidity or occupancy. For a multi-room heating and cooling solution, however, this three-pack is the logical, effective upgrade to a basic smart thermostat setup.