The NEW CALOREX Pro-Pac range of pool heat pumps have sound-proofed compressors. These have reduced the overall sound level by over 50% and have done away with the combination of fan and compressor noise. Now all you can hear is the fan which is also a new generation of axial fans which are 20% quieter than their predecessors. Once again Calorex are way ahead of their competitors.
See more at http://www.acair.com/pool-heating/