When weening my quail & chicken chicks off of heat, I use an LED type night light. Very very low electric consumption, low light, but enough to keep the monsters behind your living room couch and not disturbing your babies. I've had this method transition them in as little as two days, and for the very stubborn chicks, as much as one week. Your mileage may vary, but the cost to try it with your flock is minimal. Best of luck 
