Whoa, Steve.  I disagree that A/C is a "must".  I can agree with any other lesser appellation but "must" is a bit much.  I seldom stick my oar in this water but I'll make this one of the exceptions.  I have over 1800 hours on my IVP which I've flown all over the U.S. for almost thirteen years and I'm not air conditioned.  Give some thought to where you'll be doing most of your flying, why you're flying there, when you're flying there, who you are flying with and if you or your passengers have to be 100% comfortable every  moment you're in the plane.  After you've done that and the answer is still yes, by all means install it.

I admit to being uncomfortable when I was flying in to Brownsville, TX regularly some years ago, and on some of the other trips south as far as the Cayman Islands.  However, it doesn't last long and I haven't had warm air out of my third intercooler that was noticeable to me.  Early on, though, in about 1968, I had an expensive gold film applied to the inside of my windows with the exception of a viewing field through the front windshield--the rest of the windshield, being the top 30% and about 4" down each side has the film.  The film was represented as being able to substantially reduce UV radiation, which I cannot measure, but I can tell you that the drop in temperature inside the plane was very noticeable to my wife and me when we were in a warm environment and I was satisfied.

The film was applied by a specialist at the Van Nuys airport, the only place that I could find to do it.  Interestingly, when flying in certain types of hazy conditions my visibility through the haze is better looking through the film than not, and I can compare.

Yesterday I flew down to Dallas from my base in Ohio, and returned home today.  The temperature each day in Dallas was supposedly well over 100 degrees.  I needed a touch of heat on the high legs and didn't linger down low but hey, we didn't buy IVP's to linger down low, did we? 

I really like Fred Moreno's suggestion about insulating the line from the third intercooler, though, and even though I haven't thought it to be a problem it might provide a little help, just like my gold film ($1700, 11 years ago, if you're thinking of asking.)  I will do it.

Carl La Rue
N 299 KT