The simplest solution is to lay an appropriate long and tick pipe app. 1.5-2 meters under the earth, through which the warm air with a filter will be pumped in, that cools down meanwhile.



Leading this fresh air, rich in oxygen into the house will be treated through an air-conditioning instrument. The humidity of this fresh and cool air in the home will also be set.

Beside this the most important is that the temperature of the used air, which is lacking oxygen but rich in CO2 will be kept in. So the cooling energy already used once will not be let out but used up again.
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Recuperator