I've built a few incubators.
You can use the tried and true thermal wafer that used to be the most common thermostat, a chink module like the W1209, or better controllers found various places.
I've used old milkhouse style heaters for the heating elements for large incubators, you use the heating coil and standoffs.
Had good luck using a SCT 1000 All-purpose 110V Fahrenheit Digital Temperature Controller from aliexpress, make sure you get the Fahrenheit ones because plus/minus half a degree Centigrade will not work well at all.
You can 3d print egg turners or buy one fairly cheaply now, they used to be pricey. Look online, lots of incubator projects often using Arduinos.
Yes! If you're certain hatching eggs is something you'll be doing for the long term, you can really make a nice incubator. My aim is for at least a few of you to get into quail. This is probably the cheapest way to make something good instead of the youtube videos with a light bulb on a dimmer.
Every time I see a video of a large setup like you describe, it's hard for me not to try it. If I ever really get into selling chicks, I'll go for broke on a fridge size incubator. When I looked into 3D printing my own egg turners, Cura claimed it would take me over 100 hours to piece one together. The arduino or pi and a servo would be easy to get done.
Right now I can easily pump out 50 birds every 2 weeks. That's about the limit for what I'd care to butcher every other weekend. Well, that's about the limit my wife cares to rinse and bag up every other weekend lol.
I hope you stick around and add to whatever info I can post on here.
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