Authoritative Guide
HVAC Airflow & Ductwork
Airflow restrictions, duct leaks, blower issues, and ventilation problems. Diagnostic procedures for uneven cooling and airflow.
Problem Clusters
Weak Airflow
Huge cluster tied to ductwork and blower issues. Weak airflow from vents, air not blowing, some vents not working.
View Symptoms →Blower Motor Problems
Blower motor not working, fan not spinning, running slowly, air handler fan not working. Strong airflow-related cluster.
View Symptoms →Ductwork Problems
Uneven cooling, rooms hotter than others, air not reaching rooms, duct leaking air. Very common in multi-story homes.
View Symptoms →Condition Variations
Narrow your diagnosis by specific conditions under this pillar.
Weak Airflow from All VentsWeak Airflow in Some Rooms OnlyWeak Airflow Upstairs OnlyWeak Airflow After Filter ChangeBlower Not Spinning at AllBlower Humming but Not SpinningBlower Running Slow or WeakWeak Airflow in Extreme HeatUpstairs Hot, Downstairs CoolSome Rooms Hot, Others CoolUneven Heating in WinterUneven After Duct WorkBad Odors from Some Vents OnlyBad Odors from Vents After Filter Change