Sick chicks please help...
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You need to be able to measure the temp, they also need to be able to get AWAY from the heat if they want to.
If the conditions are not right that alone could kill them.
Might want to start by reading this article: http://www.backyardchickens.com/a/how-to-raise-baby-chicks-the-first-60-days-of-raising-baby-chickens