Frizzles in winter

[Ishtar]

The night temps have just started dropping in OK. I am raising frizzles for the first time and am concerned about their ability to insulate and keep warm. Does anyone have experience or advice as far as coop modifications, insulation, ideal minimum temps, etc?

 

[Poultry parent]

when we had a silkie i set up a red heat lamp and he did very good, check the coop for drafts as well