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  1. #1
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    Prices of Aircon and how many BTU

    Reading around I get the following information
    I understand that there are a lot of variables like direct sunlight insulation etc

    The situation is that i have to fit out a typical 2 story thai shop house. The floor plan is approximately W4meters*L13m*H5m for the bottom floor and W4meters*L10m*H4m for the top floor

    How many BTU?
    A common figure that I have seen is
    12,000 BTU per 500 ft2 or 46m2 (considering standard cielings 2.4meters?) in a well insulated house
    That = 260 BTU per m2

    other common figures are below
    http://www.lowes.com/lowes/lkn?actio...nditioner.html

    Area To Be Cooled
    (square feet) Capacity Needed
    (Btu's per hour)
    100 to 150 5,000
    150 to 250 6,000
    250 to 300 7,000
    300 to 350 8,000
    350 to 400 9,000
    400 to 450 10,000
    450 to 550 12,000
    500 to 700 14,000
    700 to 1,000 18,000

    Another figure that I have seen relative to Thailand, that is no or poor insulation with window cracks etc and higher cielings. (can't remember where I got it) is
    400 BTU per m2

    What does anyone think?

    Brand name?

    The situation is that the aircons will be used considerably. Planned at near 24hrs a day

    I've heard 'mitsubishi electrics' are the best for quality and economy and hold a premium price

    Any other brands worth considering? Anyone know the ballpark figures for units?

    Based on the 400 BTU per m2 I think I will need
    21000 BTU ++ probably a 24000 BTU for the bottom floor and a 16000 BTU for the top floor

    I've probably answered my own questions but would appreciate any pointers especially if you've bought aircon units in Thai

    Thanks

  2. #2
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    dirtydog's Avatar
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    You have answered most of your own questions, mitsibushi is the best brand for resale, but you also have to take into account that for each person in the room you need about another 500btu to counter act their heat, also I think you have done your btu calculations on floor area as opposed to actual cubic meters of area.

  3. #3
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    aging one's Avatar
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    He is right on Mitsubishi, by far the best but the most expensive. He is also very right about extra people = more air. Not if they are sleeping at night. But if they are up and about you have to pump up the BTU's.

  4. #4
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    Where can I get some nice & cheap recon units?

  5. #5
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    man with no head's Avatar
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    Any one used a cellar for cooling the house? What about cost of central air versus using a separate unit for each major area to be cooled?

  6. #6
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    Surasak in BKK itself even a cellar wont get very cool in the summer. And the price would be damn high as you hit water a meter down. I have always wondered about central air here as well as thats what we had when I was a kid. The standard answer given by Thais is. To expensive to install and a lot of wasted cool air in rooms you are not using. Even if you shut off the vents.

  7. #7
    Somewhere Travelling
    man with no head's Avatar
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    Oh, wasn't thinking about Bangkok but further upland in the Korat Plateau. I've been to many places in the U.S. where the desert is boiling hot but 20 feet down you still have ice in ice caves from long cooled lava tubes.

    I was wondering if there would be a way to dig a cellar and use the cooling properties of the earth to cool the air without need of compressors (ever notice how the tile floors are cool even on a blistering hot day?) Could be used as storage also, I read on another forum about putting a living/sleeping area underground like that for comfort without needing active cooling.

  8. #8
    Have you got any cheese Thetyim's Avatar
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    My house is on the side of a hill and has a half cellar on the ground floor.
    It is definitely the coolest place in the summer but I doubt if I would gain much by pumping the air into the rest of the house.

  9. #9
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    Where can I get some nice & cheap recon units?

  10. #10
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    Quote Originally Posted by Marmite the Dog
    Where can I get some nice & cheap recon units?
    Don't bother, they will be crap and troublesome, never buy second hand in Thailand....

  11. #11
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    Marmite the Dog's Avatar
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    Where can I get some cheap new aircon units then?

    If you needed to have a room cooled 24/7, would you be better off using two smaller units rather than one big one (in case one fekked up then the smaller one could struggle on until the other is repaired)?

  12. #12
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    for your cold room most defineately 2 units.

  13. #13
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    Quote Originally Posted by Marmite the Dog
    If you needed to have a room cooled 24/7, would you be better off using two smaller units rather than one big one (in case one fekked up then the smaller one could struggle on until the other is repaired)?
    But would be near double the price to run!
    Buy some cheap no brand AC if your not going to use a lot, a drive around the "cash & buy" shops in Pattaya would find some nice looking units - no gaurantee's though!

  14. #14
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by Marmite the Dog
    Where can I get some cheap new aircon units then?
    Tesco.
    They had some end of range units going half price

  15. #15
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    I'm looking at Dec before I can afford them I think.

  16. #16
    I am in Jail
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    I've bought several new Panasonic units recently. They are quite nice.
    I use 2 18000btu units to cool a 68sqm 2 room condo. Turn both on to cool the place fast. After the tile floor is cooled down I can just run one in "automatic" mode.(nice feature)

    In my shop I have 3 35000btu generic 3 phase units which run full tilt 10-12 hours a day. these units only have low,med,high settings. They are pretty efficient.

    One more word of advice watch out for the real cheap cut rate guys. Not all installations are equal and being able to get the people back to fix a problem is worth paying a little more imho.

  17. #17
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    common figure that I have seen is
    12,000 BTU per 500 ft2 or 46m2 (considering standard cielings 2.4meters?) in a well insulated house
    That = 260 BTU per m2
    -----------------------------------------------

    Your numbers seem off. Maybe the site is a non-tropical website( did not check)

    I bought a few top of the line Diakin Air cons and a cheap Samsung over the years. Diakin is worth the money, especially for the bedroom where you want a nice quiet consistant air con. I also have a second hand Mitzu which is great.

    12000BTU would be lucky to handle a 28 square meter room. Most of the year you would be fine but in April the air con will be working hard, especially after a few years and it becomes less efficient.

    I have a 44 sq m room and the biggest 24000 BTU is required but still wont make it super cold. Price range is 40-55K Bhat for this size air con

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