LadyCat, do any of your styrofoam have the wafer thermostat?I have 4 of the hovabators incubators (wafer thermostat style, upgraded with fans/turners) and have had very good success with them over the last 4 years +, hatching out about 4000 chicks so far. (3 are dedicated incubators, 1 is only used as a hatcher)