What does a dirty air filter typically lead to in an HVAC system?

A dirty air filter in an HVAC system restricts airflow, which can lead to reduced air circulation throughout the space. This restriction can contribute to a buildup of dust, allergens, and pollutants within the indoor environment, ultimately resulting in a decrease in indoor air quality. When air filters are not regularly changed or cleaned, these contaminants can accumulate and circulate through the system, potentially leading to respiratory problems and other health issues for the occupants. Additionally, the system may run less efficiently, contributing further to air quality concerns. Therefore, maintaining a clean air filter is essential for promoting better indoor air quality and ensuring the HVAC system operates effectively.