Personally, I have kept an bred Amazons through 3 generations (about 20 litters in total), over 10 years when I lived back in Northern Ireland. My caging was simple. I have glass cages built by a friend. Each measured 18" wide, 24" high, 24" deep. Front sliding doors mounted on a 3" lip. There was an 8* hole cut in the top that i covered with fin mesh. Above that, I used ceramic heaters controlled by pulse proportional stats, and also I had an ultrasonic misting system venting into the cage. That system came on twice a day - morning and evening for 10 minutes each time. The cage floor had paper towels and in each cage I had several pothos plants. These worked incredibly well. My amazons as adult ranged in size from 4ft to 6ft, eating small to large rats. Litters ranged from 14 to 25. I never had an issue with them drying out due to the ceramic heaters.

Here in my lab in Tulsa, I have a pair of Corallus ruschenbergerii. These are in zoomed cages (24 x 18 x 18), and each has a ceramic heater controlled by a pulse proportional stat and an ultrasonic huimidifier venting into them. I have a low wattage, non-heat emitting light for show.

As such, I would argue that Ceramic heaters are not the way to go. They have worked exceptionally well for me over the years.

Warren