Changing your air filter is one of the most important steps of HVAC maintenance. As a homeowner, you can perform this simple HVAC repair on your own. When you are replacing your furnace air filter, it is critical to determine the airflow pattern of your filter. The airflow pattern marks the direction in which air moves in and out of your system, and furnace filters work properly when they are aligned with the airflow pattern of the unit. For help with any other heating and air concerns, be sure to contact a company offering one hour heating and air conditioning in Nashville. To learn more about determining furnace airflow direction, watch this video from essortment.