Fine Tune is Lyric's way of making sure that when you set your thermometer to 70 degrees, it actually feels like 70 degrees. There are many factors that play into comfort beyond the indoor temperature. For example, 70 degrees Fahrenheit with 10% humidity feels very different than 70 degrees with 90% humidity. When heating or cooling your house, Fine Tune takes into account the indoor temperature, indoor humidity and outdoor weather conditions to ensure that your home will feel like your desired temperature. This may mean that the temperature reading on your Lyric is slightly different than the reading on your old thermostat or thermometer. Fine Tune is automatically activated when you set up your thermostat. If you do not wish to use Fine Tune, you can disable it from your Lyric app. Click here for directions.