If you're using a gas furnace, the heat exchanger is the part responsible for heating air that circulates around your home. Remember that your heat exchanger cycles between being cooled and heated, which can lead to wear and tear over time. Eventually, it can crack due to stress and fatigue. Even the smallest crack from your heat exchanger can expose you and your family to carbon monoxide. Here are the signs to pay attention to so that you can seek timely heating services.