Both liquid and gas moving in pipes are unaffected by ambient temperature, while they change the temperature of their surroundings. I have a closed loop of of -200C hydrogen that is cooling my base / water supply that has not heated up at all over 10X+ cycles.
Also tried a giant heat exchanger passing 10X wheezeworts and it didn't lower the liquid temperature by 0.1 degrees.
Build a pipe network through an environment of different temperature than the intake fluid. Note that the temperature does not change from fluid input temp.