Various embodiments relating to controlling ambient environmental conditions to affect one or more human subjects wearing wearable computing systems are disclosed. In one example, a head-mounted computing system includes a see-through display configured to present an augmented reality image in front of an environment when viewed through the see-through display, a logic subsystem, and a storage subsystem. The storage subsystem may hold instructions executable by the logic subsystem to present the augmented reality image via the see-through display, and during presentation of the augmented reality image, send a command to control an environmental control system external to the head-mounted computing system. The command may be configured to trigger adjustment of an environmental parameter of the environment to enhance presentation of the augmented reality image.