Could it be ac oversized?

Hits temp setpoint in 4 minutes, shuts off. Doesn't run long enough to pull moisture. Solution: variable-speed or right-sized replacement.

Could it be coil too dirty?

Dust insulates the coil → less moisture condenses on it → less dehumidification.

Negative pressure inside pulls humid summer air through cracks. Air-seal the home.

Some homes leave the humidifier on year-round. Turn it OFF in summer.

In a tight, well-built home, the AC alone can't keep up. Add a whole-home dehumidifier.

Troubleshooting

Quick answer

An oversized AC short-cycles and doesn't run long enough to dehumidify. Other causes: dirty coil, undersized return ducts, no dedicated dehumidifier.

AC oversized
moderate

Hits temp setpoint in 4 minutes, shuts off. Doesn't run long enough to pull moisture. Solution: variable-speed or right-sized replacement.
Coil too dirty
easy

Dust insulates the coil → less moisture condenses on it → less dehumidification.
Air leaks pulling humid air
moderate

Negative pressure inside pulls humid summer air through cracks. Air-seal the home.
Whole-home humidifier left ON
easy

Some homes leave the humidifier on year-round. Turn it OFF in summer.
Need a dedicated dehumidifier
moderate

In a tight, well-built home, the AC alone can't keep up. Add a whole-home dehumidifier.

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