Method and device for heat recovery from ventilation of preferably large rooms, factory workshops and the like

The method or device serves to recover heat from ventilation of preferably large rooms, factory workshops and the like in buildings with high humidity. This occurs especially in rooms and workshops that are heated with infrared radiant heaters, and are equipped with an intake-air duct for conveying outside air into the interior of the building and an air discharge duct for conveying extracted air from the interior of the building out into the open. To be specific, the extracted air is passed through the evaporator (4.1) of a first heat exchanger (4) and then through the evaporator (5.1) of a second heat exchanger (5), being cooled in the process so that it is below the dew-point line of air. The intake air is passed firstly through the condenser (4.2) of the first heat exchanger (4) and then through the condenser (5.2) of the second heat exchanger (5), being warmed in the process.