This could be an air conditioning system with lower performance, since the surface of the evaporator coil does not reach the ideal temperature to remove moisture. Another could be that perhaps the installed system was oversized. While humidity levels may vary depending on personal preference, it is recommended to keep your home's relative humidity below 50% when outside temperatures exceed 50°F. Anything higher than 50% creates several problems for you, your family, and your home.
Too much humidity in the air conditioner allows microorganisms, including dust mites and mold spores, to thrive, which could cause family health problems Another problem that will result from high humidity is the accumulation of moisture in windows, doors and even on wooden furniture, which with the weather can cause serious damage. This is the most common culprit of increased humidity while the air conditioner is running. If the air conditioner is oversized, it will start running a short cycle. You can read exactly what AC short cycling is here.
Your home stays damp or the humidity increases when the air conditioner is turned on, there may be a problem with the air conditioning system. Older air conditioning units are often to blame for increased humidity, but a system that is too large can also cause humidity to rise. Running the air conditioner with the fan turned on can also increase humidity. The fact is that an oversized air conditioning system does not control temperature and humidity well.
This is because the powerful compressor turns on and off frequently, so the system never works enough to remove moisture from the air.