Why is the inside of my dryer wet? How come there is water collecting inside of my dryer?
We live in the south, and from June through September, it's hot and humid! Your home has a vent with a 4” opening to the outside. All that hot humid air from outside is consistently trying to make its way into your house. When the hot humid air meets up with the cool metal parts of your dryer, it condenses and turns back into liquid water. It's kind of like when you put down your drinking glass and water forms on the outside of the glass. Don’t worry, to some degree, this is normal.
Sometimes there are some mechanical issues that could make this situation worse:
A dirty or inadequate vent cap on the outside of your home could allow hot moist air back in.
A poorly designed ventilation system can trap moisture in your vent.
Improperly sealed vent pipes and seams can allow more warm moist air to enter.
A laundry area that is very cool or an HVAC duct right over the washer and dryer can cause the dryer to be very cool when not in use.
There are some things that you can do to help minimize the moisture build-up in your dryer, but it might not be possible to completely prevent it altogether. Keep in mind that when it's 90+ degrees outside with high humidity, it is very difficult to prevent moisture from coming back into your home and condensing into liquid. Even if everything is 100% correct and built to building code you might have some moisture build-up in your dryer.
Things that might help:
Remove the clothes from the dryer immediately when the dryer completes the drying cycle.
Leave the dryer door open when it's not in use.
If you have been leaving the door to our laundry room open, you could try shutting it or vice versa, depending on how your HVAC system works.
If you have an HVAC vent in the laundry room, you might try closing the louvers.