Final answer:
Adobe houses emit heat on cold nights, thanks to their thick walls that absorb and store solar energy during the day and release it when it's colder.
Step-by-step explanation:
On cold nights, the adobe houses, which are commonly found in regions such as Spain, give off heat. This is because the adobe walls are designed to be several feet thick with small windows. They function by insulating the interior against extreme temperatures. During the day, they absorb and store heat from the sun and then slowly radiate it back into the house when temperatures drop at night. This makes them an effective natural climate control system, keeping the house warm on cold evenings without the need for additional heating sources.