So it’s got a lot to do with how a thermostat works, if you set a temperature of 70 then it will try to maintain a temperature of 70 on average. The heat kicks in when the temperature drops below 70… say at about 68-69, and then it runs the heat till it reaches say 73. Then the heat cuts off. It’s nearly impossible to maintain exact temperature 70 but the average will be that. Where the sensor in your case the nest is in reference to the heat went and how effective the heating is, how well the room is insulated to hold the temperature all plays into it
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