Temperature
Temperature for a humidor affects both the cigars and the humidity level. Too hot and it causes rot in the cigars. Too cool and the humidor will not sustain a proper humidity level -- as cool air requires more moisture, the cigars may become wet and moldy. The proper temperature setting is between 64 and 70 degrees Fahrenheit.
Humidity
Maintaining moisture at a constant level is necessary to keep the cigars aging at a consistent rate. A dry cigar that has lost it's flavor is not pleasant, nor is a soggy cigar with a musty taste that is hard to draw. Humidity should be maintained at 68 percent to 72 percent to keep the cigars at their best condition and taste.
Controls
By design, a humidor is built to hold a constant humidity if the element is maintained. A good hygrometer will monitor the levels. Store the humidor in a room that is not too cool or hot for consistent temperature. Keep the humidor out of the sun and monitor the levels regularly.