Moisture near furnace

[TonyL]

A few weeks back we started getting a mold smell in the furnace/laundry room. I couldn't see anything, so I started checking with a moisture meter.



It measures about 17% here and goes up to 25% at the bottom.



25% down here

Zero moisture here, though, which seems odd? 90 degrees to wall that shows moisture.




I took off the panel above the furnace. No sigh of leaks and meter reads 0 on all drywall inside (of course it's hot in there, so if there was moisture it would go away quickly)



I guess it must be coming from above?

[akaothermick]

Laundry room?, check the dryer vent is not leaking, and is clean, no lint build up for starters, lot of moisture is put out by a dryer. The furnace vent puts out heat and humidity, so it might not "dry" itself off like you think it would, as in steam.