Visible debris in accessible ducts can justify cleaning, but many airflow and comfort complaints are mechanical rather than cleanliness problems.
Visible debris
Dust or construction material visible at accessible registers and returns can be documented for a scope discussion.
Recent renovation
Drywall and construction dust can enter openings when systems are not protected, though the full system should be evaluated before claims are made.
Know the HVAC boundary
Uneven temperature, noise, refrigerant issues and equipment faults require a qualified HVAC professional.
