Forgot to add another idea that I used in one of my stories. (Percy's Mission I think.)
If a period of extended freezing weather is expected, and water is available, especially if it is from a pressurized system, a person can use a hose with a spray nozzle and build up a mound of ice over a period of time. Have a pad prepared, with a gravel base containing a perforated drain pipe to capture any excess water and the water that will eventually melt off the ice. As long as the freezing weather persists, just keep adding ice to the mound. Once it looks like the temperatures will go above freezing, cover over the ice mound with insulation of some type. Having lots of straw, or even hay bales, will work great for this. Just stack them up and over the mound. Lots of other things can be used, as well.
Ice can be chipped off the mound from an exposed area. Or, as in the story, if a structure is made, with a tunnel entrance, the ice mound can be formed up and over the structure, creating an 'ice house' that does not store ice, but is a cold room to store foods or whatever. If at all possible, if the items can be pre-chilled before going into the cold room, so much the better.
An idea based on these two posts, to create a cooling system, is to build a 'cistern' with a large hatch, into which molded blocks of ice can be stacked on a slatted floor below which is a series of pipes through which water is circulated into heat exchangers to provide cooled air for space air conditioning, a chilling box, etc.
As the ice melts, the cold water collected can also be used, either one off, or circulated in the same or other cooling circuits. If run through a purifier, you can even have a source of cold drinking water.
If anyone has any questions about these systems, feel free to ask.
Just my opinion.