The easiest way to assess your home’s indoor humidity level is to use a hygrometer. These tools are relatively affordable and can tell you if your home’s levels are too high or too low.
You can also watch for signs of high humidity inside, such as:
Foggy windows
Visible mold growth
Rotting wood
Unexplained allergies
Moist/clammy air
If you notice these symptoms, you need to look into purchasing a dehumidifier and remedying the situation - before they escalate into more serious problems.