I would opt for a std size hole filling pure DC unit that vented to the front , into the cabin.
The better pure DC units will operate with far less electric as the compressor speed is matched to the load .
This high efficiency is never cheap , but the Danfoss units on a Sun Frost or in many of the best marine/RV units is worth it to the non electric boat > cooks with propane <.
A home cheapo 120v unit and $100 inverter is fine for the folks that anchor out infrequently , so need not bother with efficiency or battery life.
For all , a SOC meter still would be the best first investment.
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