Maintaining a low temperature requires continuous work as you can't stop heat transfer completely. This consumes energy and requires some machinery to produce o

Maintaining a low temperature requires continuous work as you can't stop heat transfer completely. This consumes energy and requires some machinery to produce or deliver the coolant. Establishing and maintaining a high pressure on the other hand is a one time effort, for example screwing back the front of a ballpoint pen puts the spring inside under permanent pressure, and even gases can be contained at high pressure with no significant loss.