A hoodless incubator is provided, which supplies both a good microclimate in the area of the patient surface (1) and guarantees good access to the patient at the same time and continuously. The incubator includes a bed (1) and an air jet unit (6) arranged above the bed (1) and directed toward the bed (1). The air jet unit (6) discharges a jacketed impinging jet, formed of an inner, air-conditioned core jet (4) and a non-air-conditioned jacket jet (5) surrounding the core jet (4). The bed (1) is surrounded by a channel-like edge area (9), which is in flow connection with the air jet unit (6) via a first feed channel (13) with a first fan (11) arranged therein and with a heating and humidifying device (12) likewise arranged therein in order to form the air-conditioned core jet (4).