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Last updated: October 4, 2026 Quick Take Smart ventilation uses outdoor conditions to decide when bringing in fresh air makes sense. Google's Smart Ventilation announcement says a compatible Nest Learning Thermostat can pause ventilation when outdoor air quality is unhealthy or temperatures are extreme. The feature assumes a ventilation system the thermostat can control. Fresh air is useful, but outdoor air is not equally suitable at every hour. Smoke or other pollution can change the decision, as can a temperature that makes ventilation less efficient. Automatic control tries to respond to those conditions instead of running ventilation on a fixed schedule regardless of what is happening outside. Before adopting that idea, separate the feature from the house around it. A thermostat cannot operate a ventilation device that is not connected to it, and a setting described in a product announcement is not a substitute for checking the equipment installed in your home. What does Google...