I'd definitely go with extra heat after such a drop in temp too. Especially since you got silkies, who's more susceptible to cold due to their feathering.
I have a fan heater, and think that works better than a heat lamp since it heats the entire coop, and not just one area.
Oh, and you should get a water heater! They're pretty cheap to buy, and there's also DIY ones. Water is crucial to the birds in cold temps.
I have a fan heater, and think that works better than a heat lamp since it heats the entire coop, and not just one area.
Oh, and you should get a water heater! They're pretty cheap to buy, and there's also DIY ones. Water is crucial to the birds in cold temps.