How Return Duct Leaks Can Result in Excessive Indoor Humidity

How Return Duct Leaks Can Result in Excessive Indoor Humidity


The fan on setting has been an space of controversy for many years. Because the air dealing with fan runs continuous, any moisture left on the coil and drain pan dumps again into the airstream when the compressor is off. When you add in return duct leaks, extra humid air enters the system.

What In regards to the Economizer?

One other part complicating my pal’s humidity points is the economizer. Constructing codes typically name for utilizing economizers on most programs. Economizers are important for air flow in programs exceeding 5 tons.

Take into consideration this: an economizer is a managed return duct leak. It’s also the closest opening to the fan inlet. Due to this, an economizer will pull extra air than any leakage website, which might add to a humidity downside.

Economizer controller settings ought to handle economizer airflow. Nevertheless, many economizer louvers don’t seal 100% hermetic, so they’re a chief location for humid air to enter the air dealing with system. Louver upgrades can present higher seals and cut back leakage.

Latent Capability Suffers

Some HVAC gear have restricted moisture or latent elimination capability. Roughly 85% of the gear’s whole cooling capability goes to decreasing the house temperature. That leaves 15% to take away humidity from the air.

It doesn’t take lengthy to overwhelm a system while you combine damp crawlspace air and 90°F exterior air with a 72°F dew level. So, you’re left with a system that runs continuous, leaving a constructing chilly and clammy. Tools efficiency will proceed to undergo until you cope with the additional moisture load at its supply.

Subsequent Steps

For those who’re coping with excessive humidity points, begin your investigation with the fan setting on the thermostat. Altering the fan swap place from on to auto could trigger your downside to vanish. You may as well examine the return duct system. Search for one thing easy, like a disconnected return duct or a number of holes within the duct system.

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