A very practical reason that is implied by this explanation but not quite explicit is related to the quantity of fluid. Because the heat of evaporation is so high, you can achieve your cooling effect with less fluid (as the previous poster said). This means way smaller pipes, which are much cheaper to install, and smaller heat exchange surface areas, reducing equipment size.
sorenabergard t1_j18rn23 wrote
Reply to comment by BigWiggly1 in Why do we use phase change refrigerants? by samskiter
A very practical reason that is implied by this explanation but not quite explicit is related to the quantity of fluid. Because the heat of evaporation is so high, you can achieve your cooling effect with less fluid (as the previous poster said). This means way smaller pipes, which are much cheaper to install, and smaller heat exchange surface areas, reducing equipment size.