Same boat here bud....literally heh. The way I get around it is we have an annual “slush fund” that I can use if nothing else is needed...heh. We pay like 50 a month extra in taxes and claim 0 dependents. That generally gives us a large tax return, if we are lucky. We use that for things like this. Last year went to the boat as well, lol.
Hoping in Feb. We will see. I think it will be worth the cost, just need to take some photos of inside and behind the fridge to see where to run it.
If able, I plan to run a “tee” and send it to the cockpit as well, with a closable vent so if we get an enclosure, I can cool that too. Every little bit of room helps with small kids.
If the best I can do is the cabin, that is fine. We slept in the cabin one night with an a/c and it was awesome, albeit I did not sleep well with people around us at the dock heh.
So, will be a few months, barring any other major needs.
For now, the portable does the job...but raining like mad atm and electricity is off so...no testing today