A stuffy, clammy, or oddly dry home doesn't require guesswork to diagnose. Checking relative humidity, or RH, with a basic hygrometer is the most reliable starting point.

Indoor RH is generally recommended to stay between 30% and 50%. Below that range, a humidifier can help with dry skin and static. Above it, a dehumidifier can reduce condensation and moisture that supports mold growth.

Since these symptoms can overlap, humidity readings alone may not tell the whole story. The next set of clues will help narrow down which type of machine actually suits your space.