Watercress is fun and easy to grow at home. Take a look at our article showing you how to use the grocery store watercress to start your own patch of watercress at home. Hydroponic Water Cress. This is an image of commercially hydroponically grown watercress.
Fog is the extreme of humidity. Humidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.2  Excess moisture in a building can lead to mold and mildew, causing problems for indoor air quality.umidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.
You cannot reliably control mold and mildew growth using only the air conditioning (cooling) system. To prevent mold and mildew growth the indoor RH (relative humidity) should not exceed 55%. In hot weather the air conditioning system does this fairly well.However the highest relative humidity in the home is likely to occur during mild weather when your air conditioner is not needed much during the day.ou cannot reliably control mold and mildew growth using only the air conditioning (cooling) system. To prevent mold and mildew growth the indoor RH (relative humidity) should not exceed 55%. In hot weather the air conditioning system does this fairly well.