1986 930T AC questions

[chamaza87]

I have a black on black 86 930 I have had for 18yrs and only have 48K miles on it. I love this car, but, I am unable to stand driving it in the summer due to lack of AC. I had a 6000$ upgrade to the AC and still I smother in it in the summer. There is also a set of B/B headers on it. New 19" tires/wheel all around and several little improvements.
I also understand AC is a second thought to a 930 and having any cool air is a plus. I am under the impression cooling air and sending it 20' may leave something to be desired.
However, as I have recently been diagnosed with asthma and the heat make it difficult to breathe for me to continue to enjoy the car in late spring through summer I need to improve the AC or sell the car!
Any suggestions?
Le