using System;

public class Program

{

    static bool FanOn;

    //In this code, any configuration with Threshold1 set less than Threshold2 will cause a fan on/off loop whenever the

    //temperature is between (FanShutoffTemp + Threshold1) and (FanShutoffTemp + Threshold2)

    public static void Main()

    {

        const int FanShutoffTemp = 20;

        const int Threshold1 = 0;

        const int Threshold2 = 10;

        int CurrentTemp = 25;

        while(true) {

            if(!FanOn) {

                if(CurrentTemp > FanShutoffTemp + Threshold1) { //If we've gone high enough over the target temp, turn fan on

                    SetFanState(true);

                }

            } else {

                if(CurrentTemp < FanShutoffTemp + Threshold2) { //If we're close enough to the target temp, shut fans off

                    SetFanState(false);

                }

            }

            System.Threading.Thread.Sleep(1000);

        }

    }

    static void SetFanState(bool b) {

        FanOn = b;

        Console.WriteLine("Turning fan " + (b ? "on":"off"));

    }

}

​

​