Dust and dirt that build up around air conditioner vents can be caused by a clogged air filter. The filter appears dirty or clogged. It takes longer to heat or cool your home. If you notice that the filter is very discolored and covered with dust or hair, this is a very obvious sign that it needs to be changed.
The particles you find in this dirty filter will most likely spread throughout the air in your home. A dirty air filter reduces airflow, which can prevent the heater or air conditioner from working properly.
