Although worm composting is very simple, there are a few key points to remember. They require oxygen just as we do. Although worms lack lungs, they can absorb oxygen and get rid of carbon dioxide directly through their skin. If the oxygen level in their environment drops, they will seek more favorable conditions. All worm bins need vent openings to provide enough oxygen for the worms to survive, but it is recommend that you periodically fluff the bedding with a garden fork or trowel to help aerate it.
Worms are usually most active at room temperature.
In Southern California, the greatest challenge for most people are high summer temperatures. If worms become too hot, they will die. It is recommended that worms bins be kept in a cool, dry, shaded and well ventilated area away from direct sun, since the bins can heat up very quickly. This is the single most important condition to monitor regularly. If the pH varies too much either way, your worms may die.