I have the ecobee lite but i dont use the smart feature because no one is home all day so i just use regular scheduling. Heat differential can be .3 .6 .8 1.1 celcius. I just looked i dont see anything for a swing setting. Honestly the furnace is going to come on as many times as it needs to keep the heat within the specified range of hysteresis and is controlled by how efficient your home is and the outside temp.

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