I don't think anyone makes a 240V portable air conditioner unit. Even if they did, it would not be switchable between 120V and 240V. That a feature would be very expensive to include in the product. There are window units which require 240V. These typically units larger than 10,000 BTU.

Portable air conditioners are strange beasts. I have been looking into getting one to use as a backup just in case my aging heat pump goes when I need it most. Read reviews on any portable a/c and you will find an overwhelming dissatisfaction. The problem is that since the condenser coil - the part of an A/C system that releases the room's heat to the outside - is actually inside your house, you need to blow the heat outside. In a "one hose" system (the most popular now), the fan that blows air across the condenser coil and pushes the warm air out through the hose creates a vacuum that pulls air in from other parts of the house and eventually warm from outside air comes in. In your scheme, you have the same net effect. The warm air from the bedroom will be moved to the bathroom. The exhaust fan will expel (some of?) that air plus create a vacuum that expels cooled air from other parts of the house. IMO, you will be happiest with a window a/c in your bedroom.

I'm going to respond to you since no one has. I've lived in SW Florida for 20 yrs and have gone thru many hurricanes. This last one, Irene took our power and water out. We get water form the local water co on the island and after a while the water stopped as well. They use brackish well water and do a reverse osmosis. When their power went out, so did our water. We always packe the refrigerator with food, canned goods anything before the hurricane and cool it a notch or so down. The fuller it is, the longer things stay cool. We run a generator with gasoline. we would run it here and there to keep the freezers going and concerve fuel. Not knowing how long we would be without power and without power the gas pumps don't work. All generators will handle X number of items, if you plug too many things in, they can't handle it. Howevere, as it generates electricity, there could be excess power just being wasted. So you learn what it can handle. I know a neighbor down the street from us had a propane tank that was connected so when the power went out, it automatically kicked in and in a safe way (it can be unsafe and can kill the electrical workers working on fixing downed lines). Your electrician should know how to wire things up. We hook up our generator and turn the main power off. It's safe for anyone working on restoring the lines but we don't know when the power actually comes back. We listen the the stillness know that the neighbors has automatically shut off:)) A 250 gal propane tank is HUGE. I would guess you could run on that for a very long time. If when it happens, take a reading of the tank, run what you want for a day and take another reading. It should give you a rough idea of the useage per hr or per day. While you may want to run your well pump, it's also a very good idea to have large containers of water handy. We have those large blue plastic containers for water and the red ones for gasoline. Water is the most precious and is missed the most during difficult times. It's also ideal to have a gas cook top or rangetop that can be lit with a match. I hope this helps you a bit in planning for the worst. Hurricane season is not far away. Semper Paratus as my latin teacher said. "always ready." Inga

Ya but we don't use the heater But you are using 'a' heater. In the summertime. The exhaust from the portable AC. By dumping it into the ductwork, you're distributing that heat all through the house.