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Had a '77 P337 for 3 years and 310 hours. The pressurization was rock solid once we found the hole some idiot put in the pressure vessel to run wiring through. I second the prebuy check of this system. It should make 3.35psi with no problem on either engine alone even at higher altitudes. If it doesn't, something is likely leaking and it will cost to find it, make the seller drop the price accordingly if you are going to buy the plane. FWIW, the P210 uses the same system and I have 3000 hours of P210 time and find that system to be quite reliable. It is the simplest pressurization setup around. The comfort it adds is wonderful and the ability to use higher cooler altitudes without oxygen is just great. Once you own a pressurized plane, you won't go back, trust me. Since you live in Florida, you might look into air conditioning for a P337, or plan to fly with the pressurization set to maintain a cabin altitude of 8000' or so.
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