Grandmaster JinBodhi: Yes, of course, but never position yourself directly in front of the cold air. When we practice Energy Bagua, we perspire; if the cold air enters the weaker parts of our body through acupoints, it causes us to fall sick easily. Nowadays, many sicknesses and allergies as well as facial stiffness are caused by cold air from fans or air conditioning. Always remember not to set the temperature too low or the fan at high speed, and do not position yourself in front of the cold air.