A thermotherapy device (1) includes a basic housing (2) with walls (14) with a support for a patient and an especially transparent covering hood (3) for the basic housing (2), which covering hood can be moved between a closed position and an open position, so that the basic housing (2) is closed by the covering hood (3) in the closed position. A guide mechanism (4) is provided for mechanically guiding the motion of the covering hood (3) between the closed position and open position. A heater such as a convection heater with a blower heats the air and/or an air humidifier humidifies the air. The covering hood (3) is moved in a simple manner and access to the support for a patient is essentially not hindered by the covering hood (3) in the open position.