I would put them outside and see how it goes. If cold they will let you know.
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I'm in the same boat here, i bought some cheap parts and build a Momma Heat Cave for my spring ducklings. It worked very good and the 'lings loved it from the first day.[…]
I just clamp the brooder light to the side and they are good to go. I still want one of the warmer plates, but as I already have the light I'll keep using it till I can get the heating plate. Maybe when my kids stop costing me so much money lol.