I can't find the Circulating Fan feature.

The circulating fan feature allows the fan to circulate air when the system is not running, and is accessible through the fan mode setting in the Sensi app, as well as the thermostat itself.

If you do not have the circulating fan option, you may not have the latest firmware update or Sensi model that has received this feature.

The circulating fan feature is compatible with the:

• Sensi smart thermostat (ST55 & 1F87U series)
• Sensi Touch smart thermostat (ST75 & 1F95U series) 
• Sensi Touch 2 smart thermostat (ST76 & 1F96U series) 
• Sensi Lite smart thermostat (1F76U-22WFB & ST25 series)

If you do not see the circulating fan feature, then connect your Sensi to Wi-Fi to get a firmware update. If you still do not see the feature, then check the models above to see if your Sensi is included.