An improved incubator (4) and control apparatus (16) include separate temperature and humidity control loops (36 38) wherein a commanded temperature (44) and a commanded relative humidity (RH) value (46) are commanded to the control apparatus via a user interface (40). The humidity control loop (36) employs specific humidity (SH) in its control operations. The use of SH rather than RH decouples humidity from temperature and thus simplifies control of both.
