Ventilation device

A ventilation device including a heat-exchanging means, said heat-exchanging means including an air-feeding passage having an inlet and an outlet and an air-discharging passage having an inlet and an outlet, comprising:

• a first thermosensitive element placed at said inlet of said air-feeding passage to detect an outdoor air temperature;
• a second thermosensitive element placed at said outlet of said air-feeding passage such that a fed air temperature is detected after the outdoor air has been thermally conditioned by said heat-exchanging means as the outdoor air circulates through said air-feeding passage of said heat-exchanging means;
• a third thermosensitive element placed at said inlet of said air-discharging passage such that a room air temperature is detected prior to the room air being thermally conditioned by said heat-exchanging means as the room air circulates through said air-discharging passage of said heat-exchanging means to exit via said outlet of said air-discharging passage;
• and
• a display unit for showing said outdoor air temperature, said fed-air temperature and said room air temperature detected by said first thermosensitive element, said second thermosensitive element and said third thermosensitive element, respectively.