Condensation drops on HVAC vents

[Donald]

Daughter in NC has drops of water on the metal HVAC vents. I assume vent metal is cold and water condensing. RH inside is 55%.

I am thinking the only solution is to add a dehumidifier to the HVAC and dehumidify more than just when the AC is actually running.

Will the vent metal or screws rust over time?

 

[hemitom]

Yes they will rust over time .
dehumidifier will definitely help.
in a hot humid climate I would insulate all duct work if possible.
Ideal humidity is 30 to 50 percent I suspect at certain point of the house the humidity is higher than 55%

 

[Mechanician]

Recirc setting should help. Make sure the door is working.

 

[Nukeman7]

Recirc setting should help. Make sure the door is working.

I believe the OP is referring to the HVAC system in the home, not a vehicle.

 

[Lubener]

I am surprised the a/c isn't lowering the RH unless its oversized for the house..A dehumidifier shouldn't be needed.

Make sure she isn't running the blower fan in the furnace all the time as that will raise the RH. when the a/c is being used.. When running the a/c the blower setting on the thermostat should be "auto".

 

[Mechanician]

I am surprised the a/c isn't lowering the RH unless its oversized for the house..A dehumidifier shouldn't be needed.

Make sure she isn't running the blower fan in the furnace all the time as that will raise the RH. when the a/c is being used.. When running the a/c the blower setting on the thermostat should be "auto".

From what I've read about matching the size of unit to the house - this sounds right.
The unit needs to run longer to achieve the set temperature, that way it can remove more of the humidity.

 

[E150GT]

I read that most systems are not properly sized especially in hot climates. I also read that newer systems are way less efficient at removing humidity vs the older units.