Make money online: YES

Green building certification and energy efficiency optimization can be a remote-friendly side hustle as most of the work can be done online. However, there might be occasional in-person requirements such as site visits or meetings with clients. Online discussions suggest that this business opportunity generally lives up to its reputation, with many practitioners finding success in the field. The level of remote-friendliness can depend on your location in terms of access to clients, time zones for communication, and the necessary equipment for conducting assessments. Potential red flags or challenges could include dealing with varying regulations in different regions and the need for specialized knowledge in green building practices. Overall, this side hustle offers flexibility but may require some in-person interactions depending on the specific project.