I googled “companionway hatch A/C”. Units that mount in the companionway seem to just block it off. One solution is a deck mounted window unit with a shroud that ducts cool air down into the bow hatch. All kinds of ways in the photos.
LOL, forty years later I’m still fascinated with air conditioning a boat cabin. As long as you’re connected to shore power, anything is possible. That 42’ Chrissie I mentioned had all the electric amenities, but no generator. Guess where it spent most of its days.
;^)
We have no ‘Windows’ lol. We have 6 large port lights in the saloon, 1 small one in the double guest port and 4 smaller ones toward th bow in the master berth and head. None of them open except the small one in the double berth. The rest are all new deadlights. I probably wouldn’t mess with it anyway for a wk or 2 out of the year. That’s why I said inside the companionway. It would be portable/moveable.