Geothermal Air Conditioner – Cooling the air. Take a 5-gallon bucket, place a fan on top, and cut out the bottom to pass warm airflow through the cold conductive U loop. Depending on soil composition, each loop will remain ~18°C/64°F regardless of the outside temperature. The loop does not have to hit groundwater, however, having the loop interact with groundwater adds extra efficiency as water contains more cooling energy for the same volume versus the thermal air. This becomes extremely useful on hot islands like Indonesia and Haiti, as it increases the efficiency of the unit on deadly days. The average 500 sq/ft developing home only needs one ~10-meter loop to prevent heatstroke in infants and elderly family members living in 500sq/ft.
Dehumidification. High heat and humidity can be lethal to babies in developing nations. By this step, the air will be cold, but close to 100% humid. To remove the excess humidity, simply cut out two membranes of ordinary floral foam, fix them apart in a sealed plastic container allowing the humid air to pass via the porous foam and out a standard air filter. Swap out the wet floral foam every 2-3 days with sun-dried replacement foam. Keep the container lid firmly secured as pressure builds. Adding trace amounts of salt and pure grain alcohol in the humidity bin prevents bacteria from brewing if not cleaned regularly. Or just clean it regularly.