June 21, 2026 – Mountain View, CA – Nest Thermostat Gets Smarter
Google has released a firmware update for the Nest Learning Thermostat (4th Gen) that improves the device’s PIR presence detection algorithms. The update, version 8.5, reduces false “away” events by 50% while maintaining energy savings.
What’s New
The updated algorithm uses machine learning to better distinguish between:
- Stationary occupants (reading, watching TV)
- Pets moving through the room
- Environmental noise (sunlight, HVAC airflow)
Google claims the new algorithm reduces false away events by 50% compared to the previous version, while still delivering 15-20% energy savings.
Performance Improvements
- Stationary occupant detection accuracy: 85% → 94%
- False away events: 8% → 4% of occupied hours
- Time to detect presence: 5 minutes → 2 minutes
The update also adds a new “Presence Learning” feature that adapts to household routines over time, pre-warming or pre-cooling the home before occupants typically return.
Availability
The firmware update is rolling out automatically to all 4th Gen Nest Learning Thermostats over the next two weeks. Users can also manually check for updates in the Nest app.