Heating, ventilation, and air conditioning (HVAC) are the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a sub-discipline of mechanical engineering based on thermodynamics, fluid mechanics and heat transfer principles. HVAC is an important aspect where safe and healthy building conditions are regulated concerning temperature and humidity, using fresh air from outdoors. It is a crucial aspect of residential and hospitality structures including single-family homes, apartment buildings, hotels and senior living facilities; medium to large industrial and office buildings such as skyscrapers and hospitals; vehicles such as cars, trains, airplanes, ships and submarines, and in marine environments. Green Spark provides immaculate customised HVAC services to a variety of buildings and vehicles.