Between an AC ambulance and an ICU ambulance, there are several differences.
Such as an AC/No-Ac ambulance is a normal patient transport vehicle with only Oxygen and stretcher support. On the other hand, an ICU ambulance is fully covered by a portable life support system. Which have oxygen cylinders, ventilators, patient monitors, BiPAP ventilators, Cpap, and other equipment like first aid kits, wheelchairs, and collapsible stretchers are available. Also, a Doctor (ICU Specialist) and a paramedic are available in ICU Ambulance.