Mold grows best in damp and warm conditions. The air dehumidifier is an excellent tool to help fight mold growth, especially when used in conjunction with two other tools; your air conditioner and a humidity gauge. The humidity gauge does just what the name implies; giving you a reading for how much humidity is in the air. You want to operate your dehumidifier so that your humidity gauge gives a relative humidity reading of between 30 and 50 percent. Mold likes to grow in temperatures between 77 and 86 degrees. Set thermostats to keep the temperatures out of these ranges. With these three tools, you can prevent new mold growth in your home or apartment.