device airConditioner = "d1";
device roomTemperatureSensor = "d2";

loop {

    let currentTemperature = loadFromDevice(roomTemperatureSensor, "Temperature");

    if (currentTemperature > 25c) {
        setOnDevice(airConditioner, "Mode", "On");
    } else if (currentTemperature <= 20c) {
        setOnDevice(airConditioner, "Mode", "Off");
    };

};