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Radiators are typically installed under windows to enhance heat distribution and combat cold air infiltration. This practice, rooted in over a century of heating principles, addresses temperature differences caused by cold surfaces. Even with modern insulation, windows remain cooler than walls, leading to drafts. Positioning radiators beneath windows warms the air in that area, reducing cold drafts and improving overall air circulation. For optimal performance, radiators should have adequate space around them, as obstructions can hinder airflow and heating efficiency.