The ideal moisture content for a hardwood floor might vary based on factors such as the species of wood, the environment, and the type of finish. However, as a general rule, the moisture content of a hardwood floor should be between 6% and 9%. This range can help minimize the risk of cupping, buckling, and other moisture-related issues. It's important to monitor the moisture content of hardwood floors regularly, especially during seasons with significant temperature and humidity fluctuations, to ensure optimal performance and longevity.