How many square feet will this 12,000 BTU PTAC accommodate?

Hello, thank you for reaching out with your question. This 12,000 BTU PTAC unit will accommodate a 400-600 square foot room/zone. Maximum capacity for this space and system could also be impacted by how many windows are in the room, how tall the ceilings are, and even by how well the room is insulated. If you have any additional questions, please feel free to reach out.