What is the lowest evaporator coil temperature that traditional mechanical compression systems can achieve?

Traditional mechanical compression refrigeration systems can typically achieve evaporator coil temperatures down to approximately -40°F. This limit is due to the properties of refrigerants commonly used in these systems and the physical constraints of the mechanical components involved, including compressors and evaporators.

At temperatures lower than this, the efficiency of the system can significantly decrease, and the challenges of maintaining such low temperatures can lead to operational issues such as compressor overheating or refrigerant issues. It's essential for mechanical systems to operate within their designed parameters to maintain optimal performance and reliability.

While some advanced refrigeration systems or specialized technologies may achieve lower temperatures, traditional mechanical compression systems generally reach their limits around -40°F, which is why this answer is considered accurate for the range in question.