While most birds can be comfortable in conditions similar to humans, they may have special environmental needs. For example, some species require regular exposure to either natural or artificial sunlight. Other species, such as tropical birds, may require higher humidity levels than we typically keep in our homes. A most serious concern to many bird owners, however, are drafts. What this means is anything from an open window to an air conditioner vent can create a situation inside a bird cage where the animal is experiencing two separate temperatures. This can put stress on the animal and lead to illness.
Fully research the needs of your pet birds, then maintain the correct habitat to keep them healthy. Closely monitor the temperature and humidity of the bird cage, and keep birds away from windows, vents and other direct sources of heated or cooled air. Regular use of misters and/or humidifiers as well as daily exposure to sunlight may also be required. Thankfully, birds can be good at letting you know when they are uncomfortable. They might fluff up feathers when cold, or hold their wings out and pant when hot. Always pay attention to signals they are sending you.