No, it is not advisable to place a Sub-Zero refrigerator directly next to a heat source like an oven. Sub-Zero refrigerators are designed to operate optimally in a controlled environment with stable temperatures. Placing it near a heat source can lead to several issues. The increased heat can strain the refrigerator's compressor, impacting its cooling efficiency and potentially causing overheating. Additionally, temperature fluctuations may affect the freshness and longevity of your food items. To ensure your Sub-Zero refrigerator's best performance and longevity, maintain a suitable distance from heat sources, allowing for proper air circulation and cooling. This will help to preserve the refrigerator's functionality and protect your food investments.