The article explores ways to make mass-building buildings more energy-efficient while maintaining comfort. By using dynamic modeling, researchers found that adjusting heating based on daily temperature changes can save energy without sacrificing comfort. They discovered that setting indoor temperatures slightly lower than usual can lead to both comfort and cost savings. For buildings facing north, energy consumption can be reduced by 12%, and for those facing south, by 19%. This approach helps optimize energy use for heating while keeping occupants comfortable.