How AC Dehumidifies
Air conditioners remove humidity as a byproduct of cooling. Moisture condenses on cold evaporator coils and drains away. This process requires adequate run time.
Oversized AC Problems
An oversized AC cools quickly but doesn't run long enough to dehumidify. Short cycles leave humidity high even when temperature is reached.
Fan Settings
Running the fan continuously (ON vs AUTO) can reevaporate moisture from coils. Keep fan on AUTO for better humidity control.
Single-Speed Limitations
Single-speed ACs either run full blast or off. Variable-speed units run longer at lower capacity, removing more humidity per cooling cycle.
Leaking Ductwork
Leaky supply ducts lose cool, dry air. Leaky return ducts bring in humid attic or crawlspace air. Duct sealing improves both temperature and humidity.
Supplemental Dehumidification
For persistent issues, whole-house dehumidifiers integrate with HVAC systems. They control humidity independently of cooling.