Where should air filters ideally be installed in a heating system?

The ideal location for air filters in a heating system is in the path of the air that enters the heating system. This placement ensures that the filters effectively capture dust, dirt, and other contaminants before they enter the heating components. By filtering the air right at the intake, the system can operate more efficiently and maintain better indoor air quality. This positioning helps protect the internal components of the heating system from damage due to debris buildup and reduces the likelihood of these particles being distributed throughout the living space.

Placing filters elsewhere, such as in the ducts leading to the outlets or in the living area intake vent, may not provide the same level of filtration effectiveness. These locations can allow dirty air to affect the heating system's performance and result in inadequate filtration. Additionally, installing filters close to the furnace can be beneficial, but not as optimal as placing them directly in the airflow leading into the heating unit itself.