I had installed 2 days after buying my 72 in July,1972, an after-market a/c brand ( Clardy Customatic Cool-Car Jet Star ) because it gets hot and humid in Georgia (Atlanta)from May-Sept. Never had a major problem with it,only recharged 2-3 times and the fan switch 3 yrs ago. it cools as good or better than new factory a/c units standard these days.Its a under dash unit with under dash vents.my owners manual/warranty has a Fort Worth,Tx. address (not sure if their still there or in business) Hope this helps. Highly recommend an a/c in any E.B.