Question, of course, is where is it coming from? Well, duh, probably the hot/wet clothes....except....all that moisture should be blowing out of the vent on the other side of the wall. Is some of it leaking to the inside?

Before I did anything else, I would check the vent-path to make sure it was blowing freely. Next I'd make certain the vent-path is sealed tightly throughout it's length. Next, I'd make sure the duct inside the machine itself isn't cracked or blown open. Every other consideration would come after.

Do you keep your lint filter clean?

Is it a gas dryer? One by-product of natural gas combustion is moisture. That's why new gas appliances that vent through old chimneys require sheet-SS liners. Could this humidity be combustion-related?

Just trying to noodle it through. Dryers are pretty simple devices. Not too many things to look for.

1. Install an exhaust fan (ceiling or wall), like those used in a kitchen or a bathroom.

2. Use some DAMPRID - available at most hardware stores. (See link below.)

3. Place a small fan in the room.

4. Use a dehumidifier.

Or a combination of the above...

-Grainlady

Here is a link that might be useful: Damprid

First off, cool air can hold less humidity than warm air before it starts condensing out. Is this room heated? If it is kept cool, almost any humidity in the warm air off the laundry and dryer shall condense out on the cooler surfaces as water. It's a given. In fact, I use this principle to dehumidify my greenouses so that plants do not sit overnight with wet foliage. I let in cold air (it contains less moisture than the ambient inside greenhouse air), heat it up so it draws the moisture off the plants, and then exhaust it.

Yes, check the vent to make sure it's clear and there are not tears or leaks where hot moisture-laden air can escape.

Yes, if your gas dryer is not vented or vented properly (if it is gas) water is a by-product of natural gas combustion.

we're having humidity problems in our brand new building. No air leaks in the ducting, but we have a lot of heat build up in the room when using the dryer. Wondering if the dryer fan system isn't blowing hard enough, or leaking through the machine

Our dryer is a 4 month old sensor dry steam dry. But we aren't using the steam