Abstract: An incubator apparatus comprising an air-tight, sealed compartment for providing an incubation chamber and a sealed control compartment for housing electronic control circuitry. The control compartment and the incubation chamber are sealed and insulated from each other by a wall. Temperature, humidity and gas content of the incubation chamber are controlled from the control compartment by way of sensors, conduits and controls coupled between the incubation chamber and control compartment. The electronic components are enclosed within sealed boxes, each box having all but one of its faces substantially positioned inside the control compartment and one face oriented to the outside, whereby the face is removable for providing easy access and removal of the electronic components. Removal is achieved without disturbing the environment inside the incubation chamber and control compartment.