Welcome aboard to ClassicParker and congratulations on the boat! Man, what a surprise to see THAT parked in the driveway - woo hoo! Wish you had a photo of your boy's smile too
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Not sure if what I do would work in your climates, but here's what I do with my opening front and then 2 side windows. For the front, I unscrewed the 2 windows wingnuts all the way to the rear of the stud (designed so they won't come off), close the front widow, latch the wingnut behind the "U"-shaped holder and then open the window up against the wingnuts, then tighten the window slider arm knobs. This keeps the window opened a crack, but tight against the locking feature so someone couldn't force it open without causing damage.
On my side windows, I keep them open 1/4" or so and close the screens, as if it's one thing we have here in New England, it flies and bugs of all shapes and types.
Now if you see this photo below, you'll see I also mounted a low-profile dorade box to the cabin top. The hole thru the cabin top is about 3" diameter and it's just forward of the thicker mounting plate Parker adds to the interior roof line (on older boats) that adds stiffness for mounting items like heavy radar units.
Where I keep my boat on a mooring, the bow most often swings into the wind, so this keep a supply of fresh through the boat and I never get fogged windows. I also do use that Rain-X product made for INTERIOR glass to help prevent fogging and it works too, but only on glass type windows. One is SOL with side-plastic rollup windows ... as a clean rag is the only thing I've found that would work.
Another topic really, but I think boats need to ventilate and in addition to the dorade box I currently have mounted, 'some year' I'll add a solar-driven fan to the front hatch glass top, set to exhaust the ari, so the boat will have continual fresh air exchange and flow.
