how deos an adobe house regulate heat?

Answer 1

There's three major things that happen in adobe (or similar) structures. First, the ceilings are high. Second, the rooms are generally open ... which means there's not much in the way of doors. Third, the external walls are fairly thick and comprised of a homogenous (meaning all the same) material.

With the outside walls being thick (and, in the case of adobe, being stone or mud brick), the heat from the sun is used to warm the brick surface before penetrating to the interior. After the sun goes down, the solid walls radiate the captured heat into the rooms (and back to the outdoors). In this manner, they act as a cooling arrangement during the hotter parts of a day and a heating arrangement during the cooler portions.

With the ceilings being high, any heat that does manage to seep into the building rises - which makes the air temperature around the folks inside more bearable.

With the open concept (i.e. lack of internal doors), the air is allowed to move freely from one room to another, allowing hotter and/or cooler air to move to somewhere there is less of it. This makes the overall temperature more even throughout the structure.

This same idea works for all structures that have fairly heavy (and solid) exterior wall construction, an open concept floor plan, and high ceilings.