The answer to 'why is my air handler high energy bills' is that there are several common causes, including a dirty air filter, leaky ductwork, a malfunctioning thermostat, or an undersized air handler. These issues can reduce the efficiency of your HVAC system, leading to higher energy usage and costs.
A dirty air filter restricts airflow, forcing the air handler to work harder to circulate air. Leaky ductwork allows conditioned air to escape, making the system work overtime to maintain the desired temperature. An improperly calibrated thermostat can also cause the air handler to run more than necessary. Finally, an air handler that is too small for the size of your home will have to work excessively to cool or heat the space, resulting in higher energy bills.