Will do them cozy and with curtains.
Thank you, this brought a smile. (and I nearly spit out my coffee).
My walls are unpainted inside - but they are hardie board. The outside was painted barn red (the cheap, 5 gal at a time, Lowes "Fence and Barn" stuff) and it made a marked difference in the heat inside the coop. If I had to do it again, both the coop and the barn would be Killz White with barn red trim, not barn red with Killz white trim.
Live and learn - I'll fix it next decade when it needs a refresh.