On a related cooling note, I've 5 portable air-cons (only hassle is the need to empty the condensate from jerry cans every couple of hours).
In terms of both energy efficiency and performance, my 5 air-cons from worst to best are : Taiyo brand (worst), Akira brand (ok), Trentios (best).
In particular, my No.1 favorite among my 5 portable air-cons, is Trentios portable air-con SIN-TP9/15
15,000 BTU
6-in-1 Functions :
Cooling, Heating, Fan, Dehumidifying, HEPA Air Purifying, WifiAuto Air Swing
Touch-screen controls with LCD display
Wifi-enabled with smartphone control (optional)
Weight: 29kg
Dimensions (mm): 350W x 535D x 600H
Important Note : washing the filters of portable air-cons are annoying, primarily because the filters are always irritatingly difficult to remove and fix back (ie. poor design). This is true for Taiyo, Akira and even other Trentios air-cons, EXCEPT for the Trentios SIN-TP9/15, SIN-TP7/14 and SIN-TP1/10 models, whose filters are so ridiculously easy to remove and fix back (I actually LOLed incredulously the 1st time I removed it, having gotten used to previous air-cons all with irritatingly difficult filters and expecting likewise), that I've decided that I wouldn't ever buy any other air-con brands or models other than these 3 particular Trentios models in the future, if replacements are ever needed.
http://www.trentios.com/products/portable/#hybrid