With the heat lamp, it's 60 degrees in the coop, maybe a little warmer than where I put the thermometer. Is that too cold for 4-5 week olds? They are acting ok, not huddled up or anything. Plus, they spend tons of time up on the roost and it's warmer up there if they needed. They're smart enough to get up to the roost if they need more warmth, right? You can see live video of they're behavior on my blog (unless you're using internet explorer). I would appreciate some reassurance that they're ok (assuming they're really ok). Thanks!