Yes, air conditioning can be installed in a shipping container. It will work well only when the unit is selected from a cooling-load calculation that includes solar gain through the steel shell, insulation, air leakage, people, lights and equipment. The installation also needs a safe electrical supply, a reinforced and sealed opening where required, a planned condensate discharge and separate ventilation for occupied use.
Define what container air conditioning must accomplish
Calculate the shipping-container air-conditioning load
Compare cooling formats against the enclosure
Keep condensate away from the shell and site
Integrate openings without creating new leaks
Cooling failure needs an operating response
Quote the load, enclosure and drainage together
Provide climate, shade, insulation, door use, people and equipment heat. Ask for the selected capacity, power, opening detail, condensate route, ventilation boundary and hot-weather commissioning.

