The answer to 'why is my air handler' is that there could be several common causes, including a clogged air filter, a malfunctioning thermostat, or issues with the blower motor or fan. Symptoms may include poor airflow, strange noises, or the air handler not turning on at all. Solutions can range from simple DIY tasks like replacing the air filter to more complex repairs that require a professional HVAC technician.
If the air handler is not turning on at all, it could be an issue with the power supply or a problem with the control board. Unusual noises like grinding or squealing may indicate a problem with the blower motor or fan. Poor airflow is often caused by a clogged air filter, but could also signal issues with the ductwork or refrigerant levels.