If you want aircon for a small room for some hours of the day, get a Zerobreeze Portable AC camping unit, and two lithium battery packs. Each pack will power for approximately 5 hours, the unit can be run off mains power directly. The batteries recharge (draw) on mains power at just under 600 watts. So you'll need 700-800 watts of mains power to recharge or use the optional 24/12 volt adaptor, but that takes much longer to recharge the batteries. If you have a diesel generator or petrol, easy done though. Just add fuel preservative to your stock, rotate it, and keep the tank/s out of direct sunlight which degrades fuel quickly even with stabilizer.