[Jonty30]

So, is this a good idea for a prepper?

[norwaypinesavage]

This only works in the cold North. Down here in southern Texas, the ground temperature is over 70 degrees. As everywhere, the deeper you dig, the warmer it gets.

[familyop]

"to keep the temp at between 50° and 53° degrees Farenheit"

Botulism would be a risk with some foods that are not properly canned with pressure cooking. Other bad things can grow in some foods stored in some ways at anything over 40 degrees.

[familyop]

Root cellars are good for keeping some things under the correct conditions. It would be good to study to find out what and how.

[Ozark Tom]

What is your ground temperature at the proper depth? Keep in mind the designer resides in Denmark.

[Wuli]

Nothing new AT ALL,

Throughout most of the U.S., the temperature of the ground below the frost line (about 3 to 5 feet below the surface) remains at a nearly constant temperature, generally in the 45 ° -50 ° F range in northern latitudes, and in the 50 ° -70 ° F range in the south.

This knowldge has been known and taken advantage of by folks in many ways for a long time.

You want your house warmwer in the winter and cooler in the summer? Just have some large measure of your four walls set from 3 to 5 feet below the surface. You will give the house a ton of insulation and shield it from both hotter summer and colder winter temps. Houses that stand totally above the surface take no advantge of natural insulation the earth offers.