Well, my girls like the heater set on 75 during the winter, but like the Jacuzzi around 100 degrees. In the summer, the A/C thermostat is usually set on 70. They have complained however, that the satellite dish on their coop heats the roof up a bit in summer, so I will be lowering the A/C...
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If you don't intend to give your chickens extra light in the wintertime for egg production, but you feel it's necessary to offer a heat lamp you can either get a red heat lamp bulb or a ceramic heating element (sold in the reptile dept of larger pet stores) to provide just the heat...
If your chickens are full grown I don't think they need the addtional heat. My coop is insulated and I don't intend to heat it unless we get a spell of days that are in the 30s or below.