Never heat a coop. Whether you have an Omlet coop or any other homemade or commercial coop. There are three HUGE problems with using a heat source.
If you're using a heat bulb, heater or pad, your chicken will be less likely to go outside of the coop to the run. They will start to become bored and may develop bad habits like pecking at each other. Pecking can be a tricky behaviour to correct without tackling the core issue, in this case, boredom.
The second problem is electricity. Your chickens will rely on the heat source to keep them warm and they won't naturally grow extra feathers and fat. When the power goes out (as it always does in winter) your chickens will freeze.
The last problem is one that haunts many chicken keepers: fire. Chickens get bored and peck bulbs, or heat sources that are near combustible materials like straw or shavings and before you know it, your coop is on fire.
Omlet Eglu chicken coops use a double-walled design keeps your chickens warm in winter by trapping a pocket of air in the same way that double glazing does on windows. There's no need to add dangerous heat lamps or lighting in winter to keep your chickens warm. When your chickens cuddle up at night, their own heat keeps them warm