I never checked out the timer mode. I just set the high limit at 81/54. Low limit is 75 so it stays off a few minutes at lights on, then its off and on. stays 78-81 and 45-54%Okay. it does not have a timer to recirculate the air in the tent. It has timers in the form of alarms. when an alarm is set, the fan uses that setting to turn the fan on and off. but say you wanted to have the fan recirculate the air every 20 minutes, the controller that comes with the t6 does NOT do that automatically.