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After some picky selection, Yan Fei chose a spot in the middle of a snowy landscape, which surely must be cold enough. By what might be more aptly called an ice mound or a snow mound, Yan Fei decided on a location, cleared away the powdery snow on top, and then started construction.
He picked out suitable blocks of ice directly from the sea and stood them upright on the snowy ground, using two blocks instead of one when necessary to prevent them from toppling over. After all, the materials were everywhere and available in every shape and size desired.
Building a house this way was really too simple; the 'walls' were finished in no time. They were just barely propped up and not very solid yet, so he needed to continue pouring water to freeze them into place.
Almost as soon as the water was applied, it could be seen freezing rapidly. If it weren't for the large build area, he probably wouldn't have had to wait to add the 'roof' right away.