Reply to Bathroom Humidity - Solutions Needed

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[quote=Anonymous][quote=Anonymous]Well not having an hvac vent is a very important detail. Also, how much of a gap is underneath the door (where air from the rest of the house comes in). Bottom line, you still need to see if it's actually functioning anywhere close to the design of 110cfm.  I stand by my suggestion that you want to remove the moist air with the fan, not waste the energy to remove the moisture from the air with a dehumidifier. [/quote]

In the world of building science it's a highly controversial question whether venting or dehumidifying is more energy-efficient. It depends on the time of year, because the air that is vented needs to be replaced with air from outside, and that air needs to be conditioned. If it's a nice spring day and it's 72F outside, yeah bringing in outside air is more efficient. But if it's the middle of winter and it's 20F outside and that air needs to be heated, or if it's August and it's 90F outside and humid and the air needs to be cooled and dehumidified, then dehumidifying might be more efficient. In fact in August it's entirely possible that the outside air has a higher moisture content than the air being vented.

The advantage of a vent fan is that it's a much simpler device than a dehumidifier.

Energy nerds will use an energy recovery ventilator, where the exhaust vent is balanced with a makeup air vent and the exhaust air is run through a heat exchanger which transfers energy (or cooling, as appropriate) to the incoming air. [/quote]

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