Posted for "F. Barry Knotts" <bknotts@buckeye-express.com>:

 The shades will certainly reduce the thermal load in the cockpit.  But
 remember, the IV-P (or any pressurized aircraft) will have an additional
 thermal load from the pressurization system.  In addition, the ventilation
 alternatives are limited by the need to seal the pressure vessel.  The more
 leaks in the bottle, the more pressurized (and therefore heated) air is
 conveyed to the cockpit.  This increases the thermal load over and above
 what a non-pressurized aircraft experiences.  It's like the heater is on all
 the time.  I don't have my IV-P together, yet, but I can say on the basis of
 flying a C340 without A/C that the only way I convinced my building partner
 to go for the IV-P was to plan on A/C from the start.  And I don't even live
 in an upwardly thermally challenged neighborhood.
 
 Barry & Denise Knotts
 Perrysburg, Ohio
 L-IVP, Conti TSIO-550, trudging onward
 
"""
  Why add the weight, expense, and complexity of a AC unit?  On my Legacy,
 I've found that the Koger Sunshade cuts out so much of the solar heating
 from the (huge) canopy that adding AC would be silly.  You only need it on
 the ground, anyway.
"""