I need a way to regulate the temperature inside my brooders while I'm away at work, etc... The temp outside may be 78 outside and 90 inside the brooder when I leave for work, but then it may be 102 outside and 108 inside the brooder when I get home. Is there a good way to install a thermostat in the brooders? Also, what should I use for the heat source if it will be turning off and on throughout the day to regulate the temp? A light bulb going off and on would really stress the birds.