Page 1 of 2 12 LastLast
Results 1 to 25 of 32
  1. #1
    better looking than Ned
    Rigger's Avatar
    Join Date
    Mar 2006
    Last Online
    17-01-2018 @ 12:27 PM
    Posts
    7,900

    What size aircon

    I want to buy a aircon for my lounge room. What size aircon do I need the room is 48 sqm and how much should I pay.
    Thanks

  2. #2
    lom
    lom is offline
    Thailand Expat lom's Avatar
    Join Date
    Jan 2006
    Last Online
    @
    Location
    Trapped in an old mans body
    Posts
    8,341
    You'll need the room height as well, aircon's do cubic metres..

  3. #3
    Member

    Join Date
    Jul 2007
    Last Online
    Yesterday @ 10:14 PM
    Location
    australia
    Posts
    176
    also you need to know how well the room is insulated (walls,ceilling,windows what kind of floor), how many people in the room on average.

  4. #4
    better looking than Ned
    Rigger's Avatar
    Join Date
    Mar 2006
    Last Online
    17-01-2018 @ 12:27 PM
    Posts
    7,900
    Ok the room is insulated well as it is a brick home with bedrooms on both sides and doesnt see and direct sun light but does have a double sliding door, also has shade front and back. normaly only 4 people in the room and a 130 cubic meters

  5. #5
    lom
    lom is offline
    Thailand Expat lom's Avatar
    Join Date
    Jan 2006
    Last Online
    @
    Location
    Trapped in an old mans body
    Posts
    8,341
    15000 BTU/Hour minimum, preferably 16-17000

  6. #6
    better looking than Ned
    Rigger's Avatar
    Join Date
    Mar 2006
    Last Online
    17-01-2018 @ 12:27 PM
    Posts
    7,900
    some one just told me

    easy, sq metres x 1,000 for BTU. so thats 48,000 BTU and say about 1 bht per BTU ?

  7. #7
    Thailand Expat
    DrAndy's Avatar
    Join Date
    Nov 2005
    Last Online
    25-03-2014 @ 05:29 PM
    Location
    yes
    Posts
    32,028
    Quote Originally Posted by Rigger View Post
    some one just told me

    easy, sq metres x 1,000 for BTU. so thats 48,000 BTU and say about 1 bht per BTU ?

    The real method is sq. inches x .732, then divide that number by the SomTam factor

    prob about 18,000 BTU

  8. #8
    Member More Volts Igor's Avatar
    Join Date
    Nov 2006
    Last Online
    10-09-2015 @ 02:35 PM
    Location
    Pathum Thani.
    Posts
    102
    Or you could use the numbers used by HomePro:-

    BTU - - - - - - - Sq Meters
    9,000 - - - - - - 9-15
    12,000 - - - - - 16-20
    18,000 - - - - - 21-30
    24,000 - - - - - 31-35
    30,000 - - - - - 40-50
    36,000 - - - - - 50-55

    30 or 36,000 BTU for your big lounge. At this size I would suggest using two smaller units for better cold distribution and if it's cool you only need to run one

    Obviously, any simple table makes lots of assumptions.

    Why not wire for two units but install a single 18,000 unit. If it's not got enough oomph install a second unit.

  9. #9
    ding ding ding
    Spin's Avatar
    Join Date
    Jul 2006
    Last Online
    @
    Posts
    12,608
    24,000 will do the trick in that room.

  10. #10
    Thailand Expat
    Marmite the Dog's Avatar
    Join Date
    Jun 2005
    Last Online
    08-09-2014 @ 10:43 AM
    Location
    Simian Islands
    Posts
    34,827
    Quote Originally Posted by lom
    15000 BTU/Hour minimum, preferably 16-17000
    At least one person has some sense around here.

  11. #11
    Not an expat
    Fabian's Avatar
    Join Date
    Jul 2005
    Last Online
    04-09-2017 @ 09:31 PM
    Location
    Hamburg, cold dark Germany
    Posts
    5,381
    Aircons, you guys have problems. It was freezing again last night.

  12. #12
    Thailand Expat
    Marmite the Dog's Avatar
    Join Date
    Jun 2005
    Last Online
    08-09-2014 @ 10:43 AM
    Location
    Simian Islands
    Posts
    34,827
    Quote Originally Posted by Fabian
    It was freezing again last night.
    No it wasn't. It was boiling, especially during the powercuts.

  13. #13
    better looking than Ned
    Rigger's Avatar
    Join Date
    Mar 2006
    Last Online
    17-01-2018 @ 12:27 PM
    Posts
    7,900
    Quote Originally Posted by More Volts Igor
    Or you could use the numbers used by HomePro:- BTU - - - - - - - Sq Meters 9,000 - - - - - - 9-15 12,000 - - - - - 16-20 18,000 - - - - - 21-30 24,000 - - - - - 31-35 30,000 - - - - - 40-50 36,000 - - - - - 50-55
    I went to home pro and they wanted 60 K for a 40 - 50 SQM job there price chart is double of what you just posted, so I went to Macro and they had nothing big enounh, so tried SR and ordered a 23,000 BTU LG with some neo plasma upgrade for 29K bht
    Thanks for the help

  14. #14
    ding ding ding
    Spin's Avatar
    Join Date
    Jul 2006
    Last Online
    @
    Posts
    12,608
    Quote Originally Posted by Marmite the Dog View Post
    Quote Originally Posted by lom
    15000 BTU/Hour minimum, preferably 16-17000
    At least one person has some sense around here.
    Thats too small for that room dude for sure, having seen the length of it in person a 15,000 would cool one end and not the other.

    The one he ordered is perfect.

  15. #15
    Thailand Expat
    Marmite the Dog's Avatar
    Join Date
    Jun 2005
    Last Online
    08-09-2014 @ 10:43 AM
    Location
    Simian Islands
    Posts
    34,827
    Quote Originally Posted by Spin
    Thats too small for that room dude for sure, having seen the length of it in person
    So have I. 18,000 BTU would be perfect.

  16. #16
    Thailand Expat
    DrAndy's Avatar
    Join Date
    Nov 2005
    Last Online
    25-03-2014 @ 05:29 PM
    Location
    yes
    Posts
    32,028
    Quote Originally Posted by Marmite the Dog View Post
    Quote Originally Posted by Fabian
    It was freezing again last night.
    No it wasn't. It was boiling, especially during the powercuts.

    I put the bedcover away as it was getting so warm recently

    then it decided to be cool again - when we woke up it was only 18C

    I had to get up at 3am to switch off the fan, then at 5am to find the cover
    I have reported your post

  17. #17
    Tonguin for a beer
    Bung's Avatar
    Join Date
    Jun 2006
    Last Online
    25-09-2016 @ 09:58 PM
    Location
    Wat Bung
    Posts
    3,845
    Thought I would throw my calculations into it here as I am about to buy two air cons.

    Lounge room- 20sq m, underneath second story cement floor, one small sliding door leading to kitchen, one large double sliding door leading outside 3x2m, 2.4m ceiling height, no sun exposed walls apart from early morning.

    12000 BTU

    Upstairs bedroom- 24 sq m one large window, no exposed walls foil under tiles vented eaves and gables.

    18000 BTU.

    This room also has an office off one side of 16 sq m which I want to be able to cool as well. Should be ok or I may have to put another small unit in later on.
    Fahn Cahn's

  18. #18
    Member
    Join Date
    Oct 2010
    Last Online
    25-09-2014 @ 01:00 PM
    Posts
    97
    If you want to cool the office and b/room then you need a 24k as 18k will be too small

  19. #19
    Tonguin for a beer
    Bung's Avatar
    Join Date
    Jun 2006
    Last Online
    25-09-2016 @ 09:58 PM
    Location
    Wat Bung
    Posts
    3,845
    But then it will be too big for just the bedroom. It is divided by a sliding door and only sometimes will cool the office as well, then it will work a bit harder for that time then close the door to sleep and ok for the bedroom.

    Best would be to do both rooms separately. Maybe in the future.

  20. #20
    Thailand Expat

    Join Date
    Aug 2007
    Last Online
    @
    Location
    Darkside, Pattaya
    Posts
    5,883
    Quote Originally Posted by Bung View Post
    But then it will be too big for just the bedroom. It is divided by a sliding door and only sometimes will cool the office as well, then it will work a bit harder for that time then close the door to sleep and ok for the bedroom.

    Best would be to do both rooms separately. Maybe in the future.

    How would it be too big, or does it not have a thermostat ?

    Better to go large and have it working at an easy pace than one too small working it guts out.

  21. #21
    Tonguin for a beer
    Bung's Avatar
    Join Date
    Jun 2006
    Last Online
    25-09-2016 @ 09:58 PM
    Location
    Wat Bung
    Posts
    3,845
    Over sizing an airconditioner is a bad as under sizing one.

    I my case here an 18000BTU unit will be ok for approx 20-30 sq m room. So at 24 sq m it will be fine.

    Add in an office of 16 sq m and it will be too small. Size it for both at 24000BTU and it will be too big for the bedroom, short cycle and not remove the humidity.

    I'll leave it at 18000.

  22. #22
    Thailand Expat Boon Mee's Avatar
    Join Date
    May 2006
    Last Online
    16-08-2019 @ 06:08 PM
    Location
    Samui
    Posts
    44,718
    What makes a significant difference too is the A/C fan action.

    The best one I've found is a Toshiba with the side to side blower coupled with the direct ventilation. Gets the cool air throughout the room better than the conventional blower.

  23. #23
    Thailand Expat
    Marmite the Dog's Avatar
    Join Date
    Jun 2005
    Last Online
    08-09-2014 @ 10:43 AM
    Location
    Simian Islands
    Posts
    34,827
    Quote Originally Posted by Bung
    Over sizing an airconditioner is a bad as under sizing one.
    Have to disagree.

    I have an 18k unit in my office where a 9k or 12k would probably do and it rocks.

  24. #24
    Tonguin for a beer
    Bung's Avatar
    Join Date
    Jun 2006
    Last Online
    25-09-2016 @ 09:58 PM
    Location
    Wat Bung
    Posts
    3,845
    Yeah but I bet it will be short cycling....a lot of other factors to consider like insulation, roof ventilation, south facing walls etc. The room may be sized for 12000BTU but needs an 18000BTU because it is so hot.

  25. #25
    Member
    Join Date
    May 2012
    Last Online
    18-03-2015 @ 11:59 PM
    Location
    Fla and Issan
    Posts
    199
    aprox 1 TBH per BTU and up

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •