The air inside your home can hold a certain amount of water vapor. The actual amount of water vapor the air can hold depends on the temperature of the air. The warmer the air is, the more water vapor it can hold. Relative humidity is a measure of how much water vapor is actually in the air, compared to how much water vapor the air could hold at that temperature. If the relative humidity is 100%, that means the air is completely saturated with water vapor and cannot hold anymore. You have probably noticed that on days when it’s very hot and muggy outside, your house feels stuffy and uncomfortable. That’s because warm air can hold more water vapor than cooler air. When outside air comes into your house, it increases the amount of water vapor in the air and raises the relative humidity. There are other sources of high humidity in homes as well. For example, cooking and showering add water vapor to the air. Houseplants also release water vapor into the air through a process called transpiration. And finally, humidifiers add moisture to the air on purpose. All these things can increase indoor humidity levels and make your home feel sticky during summer days.
High Home Humidity Sources
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