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Installing aluminum foil behind radiators can help reduce heating costs, but its effectiveness varies based on wall type. The greatest benefits occur with radiators on uninsulated exterior walls, while interior walls offer minimal advantages. Proper insulation is crucial, and foil should not replace thermal insulation. Additionally, the arrangement of furniture affects heat distribution, so radiators should remain unobstructed. Using specialized reflective panels is recommended over standard kitchen foil. Realistic expectations are necessary, as foil can only slightly mitigate heat loss without adequate overall insulation.