This idea is motivated by the readings of this Hungarian weather station:
It sits within a ponor/doline which is basically a hole in the ground that allows the collection of the dense cold air. It can be seen that as soon as the sun stops directly shining into it, the temperature starts to decrease quickly, then during night the temperature is below freezing.
In other parts of the country there is a heat wave with 35°C during day and 22°C at night. But that hole freezes and also doesn't heat up much during the day.
During a heat wave the sky is clear and there is not much wind, so a hole can lose a lot of heat by radiating it out. The air within cools down, becomes denser but can't escape anywhere, so it stays there such that a temperature inversion occurs and this happens.
To replicate this artificially, excavate large a hole in the ground and put the excavated earth around it to form a large basin to contain cool air, then the coolest air sinks to the bottom so we can add a drain at the bottom where we can drain the cool air to cool the house, and this hole can also double as rainwater collector.
Question: would it work? Or did anyone attempted to use something like this for cooling?
I searched the web and found nothing. Absolutely nothing. There is a term "fagyzug" for these kinds of holes Hungarian. There is also a term "hideg légtó" to describe the cold air collecting there, but Google Translate fails to provide useful translation for either.
There are topics about radiative cooling systems which use expensive materials that are highly emissive in long-wave infrared. But my idea is just a hole in the ground nothing else.