What is Adaptive Intelligent Recovery and how does it work?

Adaptive Intelligent Recovery allows the thermostat to 'learn' how long your furnace and air conditioner take to reach your desired temperature. You set your program schedule to the time you want the house to reach your desired temperature, and the thermostat turns on the heating or cooling at just the right time to reach that temperature at your scheduled time. (Page 9)

From the official Honeywell Pro Th4210D manual, page 9

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