About this item Fast and Stable RefrigerationBuilt-in energy efficient compressor, using R290 refrigerant, circulation cooling without pollution, no need to add extra, to provide you with fast and stable refrigeration effect Effective Heat DissipationThe aquarium chiller has 2 built-in silent fans and pure copper heat sinks, and the front and back are designed with cooling holes to provide strong ventilation, which can dissipate heat efficiently and ensure the compressor works for a long time. Note that a 6”/15 cm space must be left around the chiller to ensure adequate air circulation and efficient cooling About The Lowest Achieve TempThe cooling effect of the chiller is affected by the amount of water, size of the fish tank, ambient temperature, etc. Without specifying the temperature setting and external conditions, generally speaking the chiller can be 5-10 degrees lower than the ambient temperature, and will fluctuate according to the actual sit