Heat is one the first elements to be considered when caring for a sick bird, Parrots use most of their metabolic resources and energy for keeping a body temperature at around 104 degrees. That is why, when caring for a sick bird, you should turn up the heat up around 85, and when the bird shows signs of recovery, lower the heat gradually, about 5 degrees per day, before reaching room temperature again,So, to sum it up, the main idea is to artificially maintain a high temperature, for the bird to be able to concentrate its energy mostly for fighting the illness.