How to Measure Humidity Indoors

Humidity problems in your home can cause serious health conditions.

Achieving the right amount of humidity in your home is essential for your health and comfort. Too much humidity can cause mold, allergies and damage to your home. Too little humidity can cause electrical problems, sparks, static, breathing problems, dry skin, chapped lips and a scratchy throat. You can control the amount of humidity in your home, however, so measure the humidity levels if you suspect a problem. If the levels are off, make the necessary changes to create a perfect environment.

Things You'll Need

• Hygrometer

Instructions

1. Purchase a hygrometer. This instrument measures the RH, or relative humidity, in your home. There are two types of hygrometers to choose from: electronic and mechanical. While electronic hygrometers are more precise, they are a bit more expensive than the mechanical ones. Calibrate the hygrometer according to the instructions that are included with it.

2. Position the hygrometer in an area of your home that you feel may have humidity problems. Avoid placing it near a chimney, a radiator or any other heat source that could affect the reading.

3. Check the reading on the hygrometer after approximately two hours. Under normal weather conditions, the indoor relative humidity should read between 30 and 50 percent. If the outdoor temperature is below 14 degrees Fahrenheit, the recommended indoor relative humidity level is 30 percent.

Tips & Warnings

• Recalibrate your hygrometer at least once a year according to the manufacturer's instructions for more accurate readings.

References

• Home Energy Resource MN: Measuring Relative Humidity
• Minnesota Blue Flame Gas Organization: Humidity and the Indoor Environment