My last and best unit is a "De Longhi" portablle 9,000 BtU unit from Wal-Mart:
http://www.walmart.com/ip/Delonghi-12-0 ... 0154185789
That is a link to Wal-Mart online for a 12,000 BtU unit which looks just like mine. Maybe I am remembering the BtU rating incorrectly.
Just Google "De Longhi Air Conditioners" and you should find some sources.
Store stocks are very seasonal and they usually go on sale toward the end of July and August.
I think you'll like it. I have an old 4 bedroom farmhouse without central heat or A/C and I use this type of unit in each bedroom for when company comes, but don't A/C them when no one is staying over.
As for the genset requirements, I can run my Honda i2000 genset on Economy mode when the temps are low to mid 80s here in KS and OK, but when the humidity and heat get higher, I have to let the genset go to max.
BUT these units really keep your boat fresh. If it's getting muggy when I come to open up the boat, I'll set the A/C unit on dehumidifier mode at the dock, and it will dry out every nook and cranny, leaving you with a sweet smelling, clean smelling boat!
I started out with the cheaper Haier units but they clogged up with water, needed draining (no 2nd air tube) and the one in the boat drowned itself out.
I need to add thatk, unlike the Haier units, the De Longhi units blow cold air out of the TOP of the unit and intake from the back and side so you can set the Co-Pilot/dinette seat forward or backward facing without changing the A/C installation ( a Bungie cord ). The unit pictured in Tom a Hawk's photo album is the first, Haier unit which blows cold air out the front side, preventing one from reversing the dinette seat.
John