The frequency of tasks like filter replacement and coil cleaning depends on various factors, including equipment usage, environmental conditions, and manufacturer recommendations. As a general rule, filters should be replaced every 1-3 months, while coils should be cleaned every 3-6 months. However, these frequencies may vary depending on the specific application, air quality, and system design. It’s essential to consult the equipment manual and consider factors like airflow, humidity, and temperature when determining the optimal maintenance schedule.