HVAC is an important part of Restaurants, Cafe & Shisha Cafe, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors. (HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.