Why it matters to you
Undersized returns, crushed flex duct, dirty coils, and overly dense filters are common in older Charleston homes and all raise static pressure. The result is weak airflow upstairs, poorer dehumidification, and a system that works harder through a long cooling season.
Practical guidance
If registers whistle, airflow feels weak, or the system struggles after you switched to a denser filter, ask the technician to measure static pressure. Fixes range from a different filter to adding return capacity or correcting restrictive duct runs.
