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If your radiator is hot but the room remains cold, the issue may lie with the window sill. A wide or improperly positioned sill can obstruct warm air circulation. It's essential to check the distance between the radiator and the sill to ensure effective heat distribution. Measuring the overhang of the sill and the gap above the radiator can help identify problems. Ideally, there should be an 8-10 cm space between the radiator and the sill for optimal airflow. Additionally, factors like poor insulation or blocked radiators can also contribute to inadequate heating.