I use a heat panel for my coop.
I know there are horror stories about heat lamps , but I have to say I bought a cozy heating panel and it worked for a few months then stopped heating , they sent me a replacement and I smelled burning in the coop , we took it off the wall and there were black singe streaks on the back , took apart the sealed electric box to find burnt wires... they offered us a new one , (no thanks)it was a wake up call for us .
I’d rather use a regular heat lamp with a ceramic socket on a thermostat or timer. Chain it up with two chains for safety and you’re done . They’ve been around for years and work well.
That’s my 2 cents about these heaters and yes I got it from amazon .