New air con

[JaseTheBass]

12000 BTU'S would be okay for your room, I am about to buy the Mitsubishi Mr Slim

Model MSY-GM12VF,12000BTU's COST APPROX 24,000 Baht

I already have one in another bedroom, they are very quiet

Well I am not rushing into this today but I did stop in at Siam and they had an 18 BTU with invertor at about 26,000 baht. I told him I had about 30 sq. Meters and 2 1/2 meters high and he tried to tell me I needed a 35,000 BTU. Now I have read a lot of different posts from the ones recommended and have yet to find one that can say this is what you need per cubic meter in one room. One I followed to the last page where it gave the sizes and al of a sudden it changed to Thai.

I noticed about a 7,000 baht difference in the convertor and non convertor. Not in the least interested in heating with it.

The closest I have been able to figure is 18,000 BTU

Edit

It was a Mitsubishi I was looking at.

That would do me. 15 to 18k btu would be spot on if I was buying.

[HullyGully]

Look on the internet, there are many site which calculate the BTU's required

Basically, you input L X W X H

Some ask about windows, number of people, printer/computers

I still reckon 12000BTU is okay

Check it yourself on the net

[HullyGully]

A room 5 x 4 x 2.5mtrs with 2 people, 3 pieces of computer kit / printers etc.

Calc's came out at BTU's 11500

[LannaGuy]

I have bought maybe 20 aircons over the years for the condos I have purchased. I found Mitsu Heavy quite good but for bedrooms it's Daiken all the way for me. I always buy more BTU's than I need as the AC does not have to work so hard.

[MadMac]

600BTU/sqm is often a quoted rough gauge which would be 18,000 for your room size. So many other variables such as how much glass is facing the sun, insulation, etc. From my personal experience I feel 18k BTU will be fine.

I believe that's what HomePro uses. Normally and sufficient is 300.

18BTU will be fine for 30sqm. Even 13 would do.

[LannaGuy]

600BTU/sqm is often a quoted rough gauge which would be 18,000 for your room size. So many other variables such as how much glass is facing the sun, insulation, etc. From my personal experience I feel 18k BTU will be fine.

I believe that's what HomePro uses. Normally and sufficient is 300.

18BTU will be fine for 30sqm. Even 13 would do.

I agree that 18 is OTT for such a small space but... it will not work so hard and can be turned down etc. For one of my small spare bedrooms I have a 14 which is perfectly adequate

[thai3]

Mitsubishi Aircons are also very quiet

Just be sure to select Mitsubishi Heavy and not Mitsubishi Electric. This was recommended by a couple of friends who are AC guys and I found out why. The external fan motor failed and it took weeks to get a replacement. He said if was a Mitsubishi Heavy he could have gotten the part right away.

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

[thai3]

Mitsubishi Aircons are also very quiet

Just be sure to select Mitsubishi Heavy and not Mitsubishi Electric. This was recommended by a couple of friends who are AC guys and I found out why. The external fan motor failed and it took weeks to get a replacement. He said if was a Mitsubishi Heavy he could have gotten the part right away.

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

[MadMac]

These are 2 complete different companies, Mitsubishi Electric and Mitsubishi Heavy Industries, they share the Logo but that's probably it.

Edited March 28, 2016 by MadMac

[JaseTheBass]

Mitsubishi Aircons are also very quiet

Just be sure to select Mitsubishi Heavy and not Mitsubishi Electric. This was recommended by a couple of friends who are AC guys and I found out why. The external fan motor failed and it took weeks to get a replacement. He said if was a Mitsubishi Heavy he could have gotten the part right away.

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

I have 2 newish triangle Samsungs. They're quiet and powerful enough to deal with the bedrooms I have them in. For the money, they were a bargain and I'd happily buy more of them.

[MadMac]

Just spoke to one aircon guy in BKK as I also need one new unit. Not a seller, the service guy. He strongly suggested to stay away from Samsung, LG and Haier. They will break into pieces, plastic parts don't last, and replacement/service will be more costly over the lifetime of let's say 10 years.

If you get a Samsung for really cheap, and they sell the old design now really cheap (same inside as new models), that may offset the possibly higher service costs, particularly in the north, where you can survive half of the time without aircon. In BKK you can't.

[Naam]

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

refrigerant leaks which require topping due to shoddy installation no matter what brand.

[Naam]

600BTU/sqm is often a quoted rough gauge which would be 18,000 for your room size. So many other variables such as how much glass is facing the sun, insulation, etc. From my personal experience I feel 18k BTU will be fine.

I believe that's what HomePro uses. Normally and sufficient is 300.

18BTU will be fine for 30sqm. Even 13 would do.

what is the definition of "sufficient" and "will do"?

[MadMac]

what is the definition of "sufficient" and "will do"?

For me personally it would be 25C. If colder I'll die. Or at least suffer. Up to you as they say

[Naam]

what is the definition of "sufficient" and "will do"?

For me personally it would be 25C. If colder I'll die. Or at least suffer. Up to you as they say

25ºC sounds reasonable although i prefer different temperatures in different rooms for different activities, e.g. 25º in my study doing some research is fine, 25º in my tv-room watching a movie is too cold, 25º in my bedroom after having slept 2-3 hours is just right but when i go to bed i insist on 16º when crawling under a light quilt after switching off the two units generating a total of 36,000 btu/h.

mileages vary.

[thai3]

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

refrigerant leaks which require topping due to shoddy installation no matter what brand.

where does it leak and how to fix, bloke seems clueless then if it is a leak

[lopburi3]

Leaks can also be within the units themselves - have had that problem (although will not rule out someone dropping it during transit or install causing the tubing leak) but suspect poor QC.

[Gonsalviz]

^{If you live in an area subject to power surges, I suggest not buying an inverter unit. Mine cost me 16,000 baht to repair and 2 months to get the parts.}

^{It was still under warranty but of course power surges are not covered.}

[Naam]

we have one of both but the Mit Heavy always needs topping up with gas every year where as the mr slim never does. Everyone says the heavy duty mit does not have a leak. Both good though far better than samsung, they are horrible units, not sure about their newer triangle ones.

refrigerant leaks which require topping due to shoddy installation no matter what brand.

where does it leak and how to fix, bloke seems clueless then if it is a leak

leaks usually occur at pipe connections at inside as well as outside units or piece meal piping at the soldering points. difficult to detect as it requires a highly sensitive and expensive gadget which does not exist in Thailand (so it seems).

rumour has it that hard or impossible to detect leaks are the darlings of aircon service people because they provide a stable income

[Tywais]

leaks usually occur at pipe connections at inside as well as outside units or piece meal piping at the soldering points. difficult to detect as it requires a highly sensitive and expensive gadget which does not exist in Thailand (so it seems).

rumour has it that hard or impossible to detect leaks are the darlings of aircon service people because they provide a stable income

Some soapy water does a pretty good job as a leak detector. Or a/c dye and a UV lamp. Old tech can still do the job.

You can get a halogen leak detector for a few thousand baht or less in Thailand. Sinokit Thailand

[Naam]

leaks usually occur at pipe connections at inside as well as outside units or piece meal piping at the soldering points. difficult to detect as it requires a highly sensitive and expensive gadget which does not exist in Thailand (so it seems).

rumour has it that hard or impossible to detect leaks are the darlings of aircon service people because they provide a stable income

Some soapy water does a pretty good job as a leak detector. Or a/c dye and a UV lamp. Old tech can still do the job.

You can get a halogen leak detector for a few thousand baht or less in Thailand. Sinokit Thailand

detecting a leak which requires a refrigerant topping after one year with soapy water is a myth.

a highly sensitive and expensive gadget which does not exist in Thailand (so it seems).

please use irony detector

[jonwilly]

My A/C packed up, Froze over inside wall unit and "Compressor/Cooler" would not shut off.

This morning young man turned up and after making quick check said 'I go'.

He came back with an electrician who took the wall unit apart and made some adjustment.

Took about 30 mins, seems to be working well now.

B500.

john

[northernjohn]

Well I certainly got the information I needed and I thank you all for that.

If some thing goes wrong with it I will just get a professional in to look at it.