some thoughts from Dozer
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A/C split systems

from Jim W

A/C feedback– I have used the split systems talked about here in Japan. They are very efficient at air conditioning, somewhat less efficient at heating, although I don’t suppose that is a problem in Thailand.

The split systems have a “dry cool” function which is very desired in humid Asian countries–it significantly cuts down on mold, mildew, etc, in the house.

So, even if you do not need A/C, you may like one of these for the “dry cool” funtion.

The units I have used cost abuot 800$ and are manufactured in China. They have a remote control and timer so you don’t have to get up to turn it on.

Because you normally place one in each room (I suppose it can A/C more than one room if you leave a door open, and they can A/C rather large rooms, but count on one per room) you only need to A/C rooms you are using when you use them. It can be a pain in the ass to turn the things on and off at first, but with remotes, timers, etc, you get the hang of it.

So, having one of these things blasting all the time may be expensive, but because you can climate control each room they may turn out to be economical in the long run.

They are easy to install–you get a template and draw it on the wall then drill holes and screw it in.

You then have to plan the drainpipe. You can drill a hole through the wall 4-5 cm in diameter right next to the unit, or you can run some pipe to a more convenient location depending on where you want the water to run to outside your house. Just remember, because water runs downhill, the exit hole needs to be lower than the unit.

I’m sure you can get good prices on these things if you order from China or in bulk, don’t let your Thai middlemen rip you to bad. Check on the internet to get prices.

Editor: Thanks for the very valuable info on split A/C units. As far as availability, A/C units are sold at hundreds of outlets in Pattaya and throughout Thailand. Many models and styles are available and they are not expensive. In Pattaya one place I like for getting an idea of ‘what is available’ is Homepro in the Carefour center. You can get an idea there and then price compare at other stores around the area.


  1. Hi Jim

    I believe this “dry cool” must be some kind of sales gimic because any ac unit (not the evaporative type already discussed) will take moisture out of the air. Thats why you have a small drain pipe. If you put a hygrometer in a typical room and cool the air down to around 80F (from 100F), you will see the RH drop from 90-95% to around 60%. For scientific reasons, this is slightly misleading as you really haven’t taken 2/3rds of the water out of the air (look up the RH tables and you will see the wieght of water equivalence). RH is used because of the subjective nature of the human experience. What you should beware of is making the air too dry (60%RH is too dry). You need to rehydrate the air to 70-75%. If its too dry then you nasal passages dry up and leave you less protected against natural viruses. If you ever get a typical flu then switch off the ac and use a fan and sweat it out. A simple flu can quickly turn into bronchial pneumonia (been there).



  2. PS, I forget to say, my worst experiences for damp and mildew were with the all in one box type of ac unit, probably because they are far less efficient Robin

  3. Robin, I don’t think it’s a gimmick, and I never got bronchial pneumonia. I don’t have a hygrometer or a PhD in airconditioning science but the difference is obvious when you use it. Perhaps you were using a model that didn’t have dry cool.


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