One very important factor when deciding if you want to have your wood cat house insulated is what specific use it is going to see. Do you plan to have a litter or will it just be used for adult cats? Having a litter of kittens while it may sound fun is really not recommended. Female cats are wonderful and generally more sociable and have a closer relationship with their owners but it is also very important to remember that if you don't have them "fixed" then you are going to have to deal with the changes which occur when your feline goes into heat. She will attract males from all over the neighborhood and her personality will change. If she does become pregnant you will need to give her special attention and care during the gestation period, the delivery and lactation. You will then have a litter of kittens to be responsible for. One option if you don't want to have your female permanently fixed is to take your cat to a veterinarian to have a contraceptive medication administered. This method can be, quite complicated as female cats go into heat several times in a year and it is much more difficult to detect. Spaying is probably the best option and the most effective for this problem since there are no side effects. Spaying can even be done at a very young age. Talk about this with your veterinarian if this is an option you are considering. Domestic cats tend to live longer if they are not permitted to go outdoors (reducing the risk of injury from fights or accidents) and if they are spayed. Spaying a cat also decreases the risk of ovarian cancer, and female cats spayed before their first heat or litter benefit from reduced risk of mammary cancer. Of course if you plan on having a litter then you probably want to not only insulate your cat house but also have it heated. | 
