The summer heat can be unpredictable, which is why you need a portable air conditioning unit to assist. Just like these HOMCOM piece. This ac unit does three jobs: cools, ventilates and dehumidifies. 'Cool' keeps the area at a constant temperature - the 16-31℃ of your choice. 'Fan' for controlled fan speed. 'Dehumidify' dries out the moisture in the air.