The answer to 'why is my air filter high energy bills' is that a clogged or dirty air filter can significantly impact your HVAC system's efficiency, leading to higher energy bills. A dirty air filter restricts airflow, forcing your system to work harder to circulate air, which uses more energy. This can also cause your system to freeze up, further reducing efficiency.
To fix this issue, you should check and replace your air filter regularly, typically every 1-3 months depending on usage and environmental factors. A clean, properly-fitted air filter will allow your HVAC system to operate more efficiently, saving you money on your energy bills.