I keep the temp at 72 during the day, 68 at night. All parrots can adjust to temps in the 60's ( some even much lower, think of those kept in outdoor aviaries ) as long as it's not a sudden drop, they need time to acclimatize. I also cover my bird cages at night to keep them cosy and free from any draughts. I have hot water baseboard heat so humidity is not a problem. I also have thermal perches, so if they're feeling chilly they can roost on them.