The ACE-HGEU90 Aircraft Air conditioning unit and Ventilation Unit provides comfortable aircraft cabin temperatures in all ambient conditions for passenger, cleaning, or maintenance personnel comfort in all types of 12-40 passenger capacity commuter and corporate aircraft. Since the ACE-HGEU90 operates using flood duct air conditioning, aircraft without external connectors may be serviced. The unit employs a 3 cylinder, 4 cycle diesel engine with integrated oil/air cooling, a 230 VAC generator, reciprocating compressor, condenser, evaporator, thermal expansion valve, blower, and air delivery system.