Rabbits are better able to withstand the cold than summer's heat. Protected from drafts, rabbits can withstand temperatures below zero. Make sure to enclose both sides and the back of the cage or hutch with clear plastic draped from the top of the hutch to three inches off the ground. A burlap flap should be placed along the front of the cage. This will keep drafts out while allowing for a mild exchange of fresh air.
Rabbits do not do well in high temperatures. A rabbit's optimal air temperature ranges from 50 to 70 degrees F. Rabbits can over-heat rather quickly and are uncomfortable at temperatures above 83 degrees F. Even rabbits who are kept inside can be susceptible to heat-related stress if air conditioning is not available.
Housing your rabbit outdoors - Be sure your hutch has plenty of shade. Create a homemade "rabbit air conditioner" by freezing a gallon milk jug full of water and placing it inside a large bowl (this keeps the condensation away from the rabbit) in the rabbit's cage. Most rabbits will lie down next to the cool bowl. Large ceramic tiles also work. Place them in the freezer and place in the cage for the rabbits to lie down on.
Housing your rabbit indoors - Use a fan to help cool the rabbit. Be sure it is placed so that the rabbit can't chew the cord. You can also immerse a light cloth in cool water and hang it over the side of the cage or pen and allow the fan to blow on the cloth. The frozen milk jug and tiles will also work for indoor rabbits.
||Overheating in rabbits should be considered an emergency and immediate steps must be taken to prevent death.
The normal rectal temperature for a rabbit is 100-103 degrees F. Watch your rabbit for panting, lethargy, or warm feel to the touch. Consult your veterinarian immediately if your rabbit's temperature is above normal or if it shows signs of heat stress.