The crankcase heater serves primarily to prevent refrigerant migration to the oil during which condition?

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Crankcase heaters are used to keep the compressor oil warm when outdoor temperatures are low. In cold conditions, refrigerant can migrate into the crankcase oil while the compressor is off, condensing and collecting there and potentially causing lubrication problems or hard starts when the unit runs again. Warming the crankcase reduces this migration by keeping the oil at a temperature where refrigerant isn’t readily drawn into it. This scenario is specific to cold ambient conditions; the other options don’t drive migration in the same way.