You need to determine how much heat is emitted from the lamp before making a final choice.
Solar powered heat lamp.
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I cannot say strongly enough that this is a dangerous practice that can cost the lives of your birds destruction of the coop and possibly worse.
Regarding pushing heat into the coop craig says a pv solar panel can power 12 volt fans to circulate warm air in daytime and a small battery will run at night often the simple dynamic of heat rising up will pull warmth into the coop on its own.
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While testing out my coop i discovered two design flaws.
Some folks still use a brooder heat lamp to heat coops in the winter.
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A solar powered heat lamp primarily uses solar power but it might have an alternative option such as battery backup.