Larry-
I don't think I've ever seen a C-16 with font windows that open.
The side ones, slide open, of course.
I think they all (CD-16 Anglers and Cruisers) have a hatch in the front deck.
Still not enough ventilation?
Custom opening front windows would probably set you back $500-$600 or more each.
How about a good electric fan or two? Fantastic Fans makes an Endless Breeze fan that is very efficient electrically for about $80. Or you could mount two or more smaller ones for individual comfort.
Alternately, you could add another hatch in the cabin roof for about $250 to $500.
I don't know of any Cd-16's with full air conditioning units.
Joe. :teeth :thup