Aeoniums prefer moderate to high temperatures between 60-75°F (15-24°C) during the day and 50-60°F (10-15°C) at night. They also prefer moderate humidity levels between 40-60%. It is important to avoid extreme heat or cold, as well as dry air or too much moisture, as these can cause stress and damage to the plant. Providing proper air circulation and avoiding drafts can also help maintain ideal temperature and humidity levels for Aeoniums.