In Germany they have whole communities which have the temperature regulated, summer and winter by this means. It is very efficient as you do not have to dig very deep to reach a level where the temperature is steady year round.
Once you lay a large diameter pipe over a reasonable length, at the right depth, a large fan will circulate cooled air in the summer and warmer air in the winter. Clearly, in cold climates, you need supplementary heating. But, overall energy costs are significantly reduced as most of the work is done for the cost of running the fan. The capital costs are higher, obviously.
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