What is the difference between Relative Humidity and Dew Point?
Relative humidity (RH) is, well, relative – basically, it tells us how much moisture is in the air relative to how much it can hold before it hits saturation. Example 80% (RH) means that the air is holding 80 percent of the moisture it can hold before it hits complete saturation i.e. condensation. We have seen it actually raining from ductwork in a basement.
Dew point is the temperature at which moisture in the air will start condensing. This is when the RH has hit 100%. In a crawl space, the air temperature can easily be 60 degrees F and 75% RH – this means the dew point (temperature when water will start condensing on surfaces) is 50 degrees F. Any surface including cold water pipes, ductwork, walls, floors, etc… that are at or below 50 degrees will develop condensation. Remember mold can grow at RH’s higher than 55%.
How to determine Relative Humidity and Dew Point?
Although RH and dew point are very different, they need each other to determine the others value. To be able to determine one of the values, you need a psychometric calculator which is available to download through our Santa Fe Psychrometric Calculator App.
By adjusting the temperature and dew point, you can determine the RH. Using the Santa Fe Psychrometric Calculator App, you can change the values of temperature and dew point to what they are in your room to determine what the RH currently is and what you need to get the values of the temperature and dew point to have the RH in the optimum range.
How to control Relative Humidity in your home?
An air conditioner removes water in the air as a by-product of getting to a cooler temperature, there is no actual control as most people think. By installing a Santa Fe Dehumidifier, you can control the amount of moisture in your home’s air enabling a comfortable living environment. Santa Fe Dehumidifiers pull moisture out of the air, decreasing the RH and risk high of dew point in your basement or crawl space. By controlling moisture, you can help prevent condensation, plus high RH, which can lead to a risk of structural issues, pest infestation, air quality problems, uncomfortable home environment, and a less energy efficient home.