Do Hermit Crabs Like Hot Or Cold Water?

Do Hermit Crabs Like Hot Or Cold Water? Do hermit crabs like hot or cold water? Hermit crabs are happiest kept at 72 to 80 degrees Fahrenheit (22 to 27 degrees Celsius). If the temperature drops below 72 degrees Fahrenheit regularly, the crabs will likely become weak, stressed, and ill. What temperature kills hermit crabs?