AC Running But Humidity Still High

Understanding the Problem

Your air conditioner does two jobs: it cools the air and removes humidity. When cooling works but dehumidification doesn't, your home feels clammy and uncomfortable even at lower temperatures. Humidity problems often indicate that the AC is short cycling, is oversized, or has issues with the evaporator coil. Addressing humidity makes your home more comfortable and prevents mold growth.

Common Symptoms

You might be experiencing this problem if you notice:

• House feels clammy or sticky despite AC running
• Windows fog up or have condensation
• Humidity readings above 50-55% indoors
• Musty smells developing
• Need to set temperature very low for comfort

Possible Causes

This problem can be caused by several factors, listed from most to least likely:

DIY Troubleshooting Steps

Before calling a professional, try these safe troubleshooting steps:

1. 1

   Set thermostat fan to "auto" not "on"

2. 2

   Check if AC is short cycling

3. 3

   Replace air filter

4. 4

   Check for ice on the evaporator coil

5. 5

   Ensure AC runs for at least 10-15 minutes per cycle

Prevention Tips

Help prevent this issue in the future with these maintenance tips:

• Keep fan on "auto" mode
• Have systems properly sized at installation
• Consider variable-speed equipment
• Use exhaust fans in bathrooms and kitchen