Exo-Terra Thermostat 600w & Hygrostat 100wWith the Exo Terra Thermostat & Hygrostat with Day Night 100w timer you can create a well controlled heating humidifying system that allows you to maintain the required temperature and humidity conditions similar to those found in desert and tropical environments. The day and night temperature and humidity can be set individually. For instance; the temperature can be set lower for the night, while the humidity can be set higher, just as it would occur