Cold-blooded animals have a lower metabolic rate than warm-blooded animals, and they do not have the ability to generate their own body heat. Instead, they absorb heat from their surroundings to regulate their body temperature. When the external temperature is too low, they cannot absorb enough heat to sustain their body functions.
Some cold-blooded animals, such as reptiles, can enter a state of dormancy called brumation during cold weather. During brumation, their metabolism slows down significantly, and they can survive for long periods without food or water. However, they still need some heat energy to survive, and they will emerge from brumation when the temperature rises.
Other cold-blooded animals, such as fish, amphibians, and invertebrates, are more sensitive to cold temperatures and cannot survive without a consistent heat source. They typically live in warm climates or in environments where they can find shelter from the cold.
In conclusion, cold-blooded animals cannot survive without heat energy. They rely on external heat sources to regulate their body temperature and, without heat energy, they would eventually die.