Question about the Honeywell Truesteam

[jechow]

I was thinking about purchasing a Honeywell Truesteam ("HTS") until I thought of a potential problem with its design. The HTS is designed turn on if the humidity level has fallen below the humidity set point eventhough the temperature setting has not fallen below the temperature set point. The potential problem is that there are different temperature gradients throughout the metal ducts, some ducts are adjacent to outdoor walls and some are running though non-conditioned areas (garage and crawlspace). If there is no call for heat and the system humidifies the home, wouldn't the moisture in the fully humidified air condense on the cooler metal ducts in the locations mentioned above?

If the answer to the question above is "no" under normal operating conditions then under what scenario would it occur? Would it occur with an indoor temperature of 72F and a surface temperature of 40F on the metal ducts running through non-conditioned area?

Thanks

[beenthere]

Would depend on how high the humidity is in the duct.

Why do you have uninsulated metal ducts in unconditioned space?

You can also wire it up that it only humidifies when their is a call for heat. It would still add more humidity then a non steam humidifier.