Just for another viewpoint, I run my P337 with cabin alititude set to 9,000' in the summer (so that I get max outside airflow - when pressurization kicks in, outside airflow reduces by about 50%), and climb to high altitude on most trips. Perhaps my brains are already fried, but I find that I get acceptable airflow during the climb. Yes, when it is 90 or 100 F outside, it is hot, but not $20K worth of hot. (I fly in the southwest quite a bit - Nevada, Arizona, New Mexico, Souther Cal.) Also, adding air conditioning has been specifically warned against by several sources, as it makes maintenance even more of a challenge (access is more difficult).
'Course I've never had air conditioning, and Bob has, so what do I know...
Kevin
Fried Brain P337 pilot.
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