ENVIRONMENT
Most rabbit caging is designed so that heat, humidity, carbon dioxide and ammonia in the cage ( the microenvironment) are readily dissipated into the animal room (the macroenvironment). The differences between the microenvironment and the macroenvironment will be minimal if the fecal catch pans are changed often enough.
USDA regulations require that auxiliary ventilation - such as exhaust fans, vents or air conditioning - be provided in indoor rabbit housing facilities when the ambient temperature is 85 degrees F. or higher. However, indoor housing facilities for rabbits are not required to be heated.