Since reading the responces on my earlier post. I will reduce the thermostat setting to 25 degrees(F). The coop has floor vents, vents in the soffet, and a peak vent. That's the reason foor the two heat lamps. I did a heat loss calculation using -20(F) as the design temp. That was with a 55degree(F) indoor design temp. I have since lowered my desired temp to 35 and will lower it again upon reading the responses. By the way. The temp controller is electronic and will only bring on the second lamp if the temp inside does not raise enough with only one lamp.