[akira2501]

> as the nearest surroundings are the hot planet, which transfer heat more effectively!

The box is insulated. In one case it's an unused refrigerator that opens on the top with more insulation apparently surrounding it. The planet may be hot but on a cold night the ground does nothing to warm me. Soil is not a good conductor of that heat at the surface nor is the air between it and the container. The planet stays "hot" because it is "insulated" as well.

[jojobas]

The ground does a lot to warm you, radiating terrestrial temperature BBR to your entire lower hemisphere, basically it's the same ~100W/sqm.

Sleeping under some tree cover on a clear night vs sleeping under the clear sky makes heaps of difference.