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Does the early morning squawking have any correlation to when the lights come on? If you go in my coop and turn on a light at night, they all start to carry on very loudly. Then add the egg songs, you have quite a commotion.
Shops that sell pet supplies, especially reptile supplies, have non-light heat sources that might be a better choice, since it wouldn't wake them up and start them squawking. Here's one:
http://www.reptilesupply.com/index.php?cPath=30_70
Many flocks do just fine with no added heat, but I don't know how cold it is where you are, and the jungle gym-coop is obviously not insulated. So if you need to add heat, here's a way you can do it without lights.
There are other ones, but I couldn't find them. Somebody posted about a 60watt radiant heat emitter, that didn't get as, so is safer than the ceramics, they don't burn you (or the chickens) if you touch them.
ETA:found it, on that same page