Portable Room Air Conditioner  

First up, looking at it without any real tech data, I would say it's not an air-conditioner in the sense that people understand, it doesn't run a refrigeration system with a compressor etc,  it appears to be what the Americans call a "swamp cooler"  or evaporative cooler -  meaning it blows air across a wet surface utilizing physics to cool the air -- they are only really effective with very low humidity - unfortunately something Thailand doesn't have.

 I have one  and sometimes use it in the bedroom during summer in lieu of the ceiling fan, and to be honest I find it to only be marginally  better that the c/fan. I suggest you research "swamp coolers and evaporative coolers on the net , there is a wealth of data there including tables showing the temperature drop you can expect based on ambient temperature and relative humidity - look at what you can expect from it using your local weather data.

Actually the unit above is an air conditioner with a compressor.  The manufacturer recommends that it be vented outside using the kit that is supplied with the unit.  I just wondered if anybody has one that they tried without the outside vent an pretty much know the answer that to be efficient it must be properly vented.  I know all about "swamp coolers" as I have used them in the deserts of New Mexico and California and have looked at the charts many times.  I'll probably buy one just to try it.  The temp is now 84F and 60 % humidity so the unit should be capable of lowering the temp to 76F.  In the afternoon when the temp rises to 100F the humidity drops to about 40% and the unit should be capable of producing 85F.  All theoretical from the charts , but the swamp coolers aren't that much more expensive than a good fan and IMHO ceiling fans don't hack it unless you are directly below them ( I have 10 installed in my house).

I have something like that. Unfortunately it's  been buried in storage for some time & I can't get a look at it, but I'll tell ya what I recall about it. If it would help I'll dig it out.

 I don't think the temp setting went down to much, maybe 28-30c. In a hot room it would blow out nice cold air stronger than any AC unit I have; however, the exhaust was also blowing out warm air. I'd strongly recommend exhausting out a window, or something, to be effective. In my case it was used out in my car port area where I'd be doing a lot of wrenching. Very effective for the area I was working and the exhaust was simply laid down in the opposite direction.  I may use it again when our new home is completed for the garage. If so, it will definitely exhaust outside.

One not mentioned problem with these portable units is that if you properly vent them to the outside the unit creates a vacuum in the room... Hot air from the unit is expelled but that air must be replaced... most likely from under the door or cracks in window fitting... Basically sucking more hot air from outside into the room...

We don't seem to have worked out that swamp coolers and portable air conditioners don't work in the same way. A swamp cooler does give you cool air but the air is cool because of its moisture content, and in Thailand the last thing you want is more moisture. They work better in hot dry countries like Arizona for instance than here. However if you want to sit outside they will keep you cool and drive away the mozzies.

I had a portable air conditioner at one time which I was able to use in my office which was the only place I could vent the hot air out of. It worked. but it was relatively expensive compared to a wall mounted one so I wouldn't buy another.

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