For the coop, I have two infrared heat lamps that I put in 3 gallon plastic buckets so the metal wouldn’t catch fire with feathers, etc. I took a short extension cord, cut it and used the male end to hook into an extension cord from the deck. I wired the bare end of the extension cord into a baseboard thermostat on the inside of the coop (you must get one that is 120 volt and water heater thermostats didn’t have the desired temp range). The thermostat then powers the outlet inside. Once it’s above 50 degress, the lamps kick off.
Cost of all materials ~$80
Heat lamps $6.50 each from Buchheit
Buckets $3 each
Bulbs $11 (noticed that name brand put off stronger heat than o ff brand)
Extension cord $10
Protective box for outdoor cord union $3
Face Plate $.20
Insulated housing $2 each
Need drill, pocket knife, screwdrivers.
Took an hour. Hang lamps low (not too low to catch straw on fire, but remember heat rises). Keeps uninsulated 8×10 coop at 35 degrees in single digit windy, weather.