Fresh/dried herbs in nesting boxes work as insecticides & have anti-bacterial properties & can act as natural wormers, anti-parasitics, insecticides, rodent control, stress relievers and laying stimulants.
Herbs for Healthy Chickens.There are a number of common herbs to grow for chickens' general health. Herbs can also be used to treat infestations of worms, lice and mites. When herbs are used as a food for chickens they will only eat what they need.
Cold weather chickens – 8 things NOT to do to in winter
Cold weather chickens – 8 things NOT to do to in winter!Personally, I think over-warming the coop should be ~ the warmer the coop, the colder it seems outside & the harder it is to acclimate to that cold.