Chickens can use a heat lamp, especially while caring for the eggs. It also means less effort from the mother chicken’s end if you place a heat lamp to help her out. Make sure it‘s not too harsh or warm, as it can cause a reverse effect. Some of the best options for heat lamps for chicken coops are – Philips Heat Lamp R40 Flood Light Bulb 250-Watt Medium Screw Base, K21761 250R40 HR 250 Watt Incandescent R40 Reflector Red Head Lamp, 250 Watt Red Brooder Heat Lamp Bulb Chicken Coop Hen House, Woods Import 550165 Do It Brooder Heat Lamp 250W, Rite Farm Products 125 Watt Red Brooder Heat Lamp Bulb Chicken, BYB 100W 110V Ceramic Infrared Heat Emitter Brooder Coop Pet Infrared Lamp Bulb, Premier Heat Lamp for Brooders, Lambs and Pets, Heat Emitter & Clamp Lamp Combo, Do it Brooder Heat Lamp, ICOCO Heat Lamp Non-light Lamp Bulbs and OMAYKEY 75W 2 Pack Ceramic Heat Lamp.