Method 1: Hydrogen radiator
1. Build a geyser water storage room. Keep in mind that the larger the container room, the more cycles there will be to cool the water inside. The size you need is about 100 tiles squared.
2. Build an isolated room along with the piping that is needed to pump hydrogen. About 13 × 8 tiles should be enough.
3. Extend the hydrogen pipes to pass through the thermal switch and then into the thermostat. Set the thermostat to turn on when the room temperature is above -6 degrees Celsius (21 degrees Fahrenheit). The thermostat will cool the hydrogen to the required temperature (about -35 ° C), while the thermal switch will prevent it from getting so cold that it begins to liquefy.
4. Place the gas pump inside the hydrogen room. Control the pipes so that they move from the gas pump to the water area, zigzag through the water as shown in the picture below, and then complete by pumping the hydrogen back into the hydrogen room.
5. Start pumping hydrogen into the room using the thermostat and gas pump. Make sure you leave the contaminated oxygen outlet until the room is nearly full of hydrogen.
If done correctly, the thermostat should cool the hydrogen down to -35 degrees Celsius (-31 F), the hydrogen should pass through the pipes and cool the water from the geyser, and the heated hydrogen should return to the hydrogen room for cooling.
Method 2: Wolframite Ladder
1. In the ice biome, create a ladder from wolframite blocks. There should be about 60 of them. If for some reason you cannot use wolframite, choose a material with the highest possible thermal conductivity and, if necessary, increase the length of the ladder.
2. Build a container at the bottom of the ladder for chilled water to collect later.
3. Use pipes to pump hot geyser water to the top of the tungsten ladder.
Due to the high thermal conductivity of wolframite, heat from the water will be transferred as it moves through the blocks. The water temperature should drop by almost 2 degrees Celsius on each block of wolframite, so it will be cool at the end of the stairs.
