Is it possible to install air conditioning system on a 1974 VW super beetle?

Yes - several companies offer complete kits for installation in cars that did not come with AC originally. Here are three links to help you. I have been seeking AC for my 1973 Super Beetle, so I am glad to help! Click here: HOT ROD AIR CONDITIONING - VW Complete AC Kits

Ihttp://gilmore-enterprises.net/GH/Air/Beetle.htm

http://www.automotix.net/partshotline-Volkswagen-super_beetle-air_conditioning-requests.html