Air con and dehumidifier

[puuchaibaa]

Am shopping for an air con unit. One feature high on my list is the dehumidification function. Can anyone recommend an inverter model that has a very energy efficient dehumidification system?

As you know sales people are useless to talk to regarding such details. In fact one claimed the LG unit that they were trying to sell did not require the compressor for the dehumidification function, which is impossible to believe.

Edited June 18, 2015 by puuchaibaa

[ryanhull]

Hey,

Check out http://www.lazada.co.th/shop-air-conditioners/

Then use youtube for reviews.... I have a samsung and LG both bought and installed at the same time and I can say the LG performs much better, as far as I am aware I do not think you can get your air con and dehumidifier combined? best off buying a decent air con and if you feel the need a separate dehumidifier but a dehumidifier may heat up the room as weird as that sounds.

LG all the way on your air cons though,

Cheers

[h90]

Most have the dehumidifcation option on the remote but how efficient it is I don't know.

But for sure it uses the compressor. It cools the air, moisture get liquid and is drained away thru the tube to the outside (at least till the tube is blocked)

[Seastallion]

Unless there's later technology, dehumidifiers work by heating the air and condensing the moisture out of it.

Air con plus dehumidifier....working at odds, I think.

The air con alone, by reducing the temperature in the room, is also reducing the humidity.

[h90]

Hey,

Check out http://www.lazada.co.th/shop-air-conditioners/

Then use youtube for reviews.... I have a samsung and LG both bought and installed at the same time and I can say the LG performs much better, as far as I am aware I do not think you can get your air con and dehumidifier combined? best off buying a decent air con and if you feel the need a separate dehumidifier but a dehumidifier may heat up the room as weird as that sounds.

LG all the way on your air cons though,

Cheers

yes but do not buy at Lazada......lot problems with them.

WE have Samsung, LG and Central and the LG is by far the worst (but most probably not the fault of LG).

I think the main brands are very similar, if the installation is done proper (which is often not)

[h90]

Unless there's later technology, dehumidifiers work by heating the air and condensing the moisture out of it.

Air con plus dehumidifier....working at odds, I think.

The air con alone, by reducing the temperature in the room, is also reducing the humidity.

heating the air???

[Seastallion]

Unless there's later technology, dehumidifiers work by heating the air and condensing the moisture out of it.

Air con plus dehumidifier....working at odds, I think.

The air con alone, by reducing the temperature in the room, is also reducing the humidity.

heating the air???

Yes...and passing the warmed air over a cool surface...the water condenses out, and the air is recirculated.

Just like the water condensing on your glass of bourbon and ice.

[ryanhull]

yes but do not buy at Lazada......lot problems with them.

WE have Samsung, LG and Central and the LG is by far the worst (but most probably not the fault of LG).

I think the main brands are very similar, if the installation is done proper (which is often not)

Hey mate, never has a problem with lazada and made quite a few orders over the years, I live up NE, always delivered fine and to be honest when your paying cash on delivery you cannot go far wrong.

[h90]

Unless there's later technology, dehumidifiers work by heating the air and condensing the moisture out of it.

Air con plus dehumidifier....working at odds, I think.

The air con alone, by reducing the temperature in the room, is also reducing the humidity.

heating the air???

Yes...and passing the warmed air over a cool surface...the water condenses out, and the air is recirculated.

Just like the water condensing on your glass of bourbon and ice.

aeh no.....

lets say you have 30 degree in the room.

Your dehumidifier heat it to 50 degree and than pass it over a surface with 30 degree: Exactly nothing will happen.

If you pass it over a surface with 10 degree the water will condensing in the air/on the surface, but no matter if you heat it before or not.

So no heating...just cooling.

My previous car cooled the air and than reheated it again so it isn't cold (only cooling to get the windows clear isn't so good on a 15 degree autumn day).

[Crossy]

I'm loathe to do this, 'coz I know exactly where we will go.

Off to DIY you go

[alanrchase]

Air conditioers all dehumidify a room as they work, that is why they are fitted with a drain pipe.

[mogandave]

Exactly. One one big downside to AC is it dries everything out.

[puuchaibaa]

Sorry didn't know the DIY topic existed here. Thanks everyone for your input. The Lazada suggestion was very useful for comparison. Never would have thought of using them to check air con prices.

Ended up getting an LG unit mainly because it has the best promotion (and warranty) at the moment. The completely contrasting experience with LG in two of the posts was a bit of concern, but I presume it is due to different models / build qualities. The one I got was LG's top inverter model assembled with Korean components, and comes with a 10 yr compressor / 3 yr wall unit warranty so I hope it will be ok.

LG also has what seems to be a slightly sophisticated dehumidification function with humidity control settings and energy saving features. Even if it's not as efficient as a stand-alone dehumidifier, it beats paying separately for a stand-alone, not to mention the drainage issue.

[Crossy]

No problem puuchaibaa, moving threads is all part of the service

Aircon threads tend to get a little, er, heated, have a look through some of the others for entertainment

[bankruatsteve]

Just curious... where in the world would one want to have just dehumidifier vs. A/C? I know lots of places that like to use humidifiers. But wait, if something is dehumidifying doesn't that mean cooling the air = A/C? I think somebody said that dehumidifiers "work by heating the air to condense the moisture". Hmmm. I'm pretty sure that air needs cooling to condense. EG: "dew point". So, what exactly is just a "dehumidifier" vs. A/C?

[puuchaibaa]

Just curious... where in the world would one want to have just dehumidifier vs. A/C? I know lots of places that like to use humidifiers. But wait, if something is dehumidifying doesn't that mean cooling the air = A/C? I think somebody said that dehumidifiers "work by heating the air to condense the moisture". Hmmm. I'm pretty sure that air needs cooling to condense. EG: "dew point". So, what exactly is just a "dehumidifier" vs. A/C?

Yes, both dehumidifiers and AC units must cool the air for condensation to occur. There may be some confusion because a feature of many standalones is to reheat the air but they do so after the condensation process. This is important in cold climates and I presume it can be turned off if desired. Some cars have a similar dehumidification function, and use the compressor constantly to dehumidify. (I suspect this is partly the reason why a BMW, for example, consumes more petrol than normal despite the efficient engine.)

Anyway back on topic and specifically re: standalone vs AC. One feature standalones have is a humidistat which allow them to automatically turn off when a certain level of humidity is reached. On conventional AC units the dehumidification function would run even when the air is dry.

I come from an area with a very dry climate so I'm probably more sensitive to humidity. But besides this, the humidity here is very harsh on things, causing soft plastics to break down and metal parts to rust, not to mention mould that gets everywhere. Thus a standalone can make sense but when I look at the initial outlay (bt 20k or more) I say to heck with it. I just need to learn to use the timer on the AC

[Naam]

Hey,

Check out http://www.lazada.co.th/shop-air-conditioners/

Then use youtube for reviews.... I have a samsung and LG both bought and installed at the same time and I can say the LG performs much better, as far as I am aware I do not think you can get your air con and dehumidifier combined? best off buying a decent air con and if you feel the need a separate dehumidifier but a dehumidifier may heat up the room as weird as that sounds.

LG all the way on your air cons though,

Cheers

goodness gracious! some eggsburtise...

[Naam]

Exactly. One one big downside to AC is it dries everything out.

in a country like Thailand drying out the air is a desired and huge big advantage called "latent cooling".

[mogandave]

Exactly. One one big downside to AC is it dries everything out.

in a country like Thailand drying out the air is a desired and huge big advantage called "latent cooling".

Both huge AND big, wow!

[Naam]

Exactly. One one big downside to AC is it dries everything out.

in a country like Thailand drying out the air is a desired and huge big advantage called "latent cooling".

Both huge AND big, wow!

a little googling could improve your technical basic education and prevents making ridiculous and irrelevant comments.

example:

Latent cooling load is a measure of the amount of energy that is necessary to dehumidify the air in a building, for example, regardless of the outdoor humidity. Cooling load needs to be considered when a cooling system is being dimensioned.

Latent cooling load refers to the wet bulb temperature. It specifies the cooling capacity a cooling system needs to be able to dehumidify a building to a desired humidity, even when external factors that create humidity are calculated in.

Factors that influence humidity include:

• People
• Different forms for equipment
• Outside air entering through doors, windows, etc.

[mogandave]

Exactly. One one big downside to AC is it dries everything out.

in a country like Thailand drying out the air is a desired and huge big advantage called "latent cooling".

Both huge AND big, wow!

a little googling could improve your technical basic education and prevents making ridiculous and irrelevant comments.

example:

Latent cooling load is a measure of the amount of energy that is necessary to dehumidify the air in a building, for example, regardless of the outdoor humidity. Cooling load needs to be considered when a cooling system is being dimensioned.

Latent cooling load refers to the wet bulb temperature. It specifies the cooling capacity a cooling system needs to be able to dehumidify a building to a desired humidity, even when external factors that create humidity are calculated in.

Factors that influence humidity include:

• People
• Different forms for equipment
• Outside air entering through doors, windows, etc.

Is this where I am supposed to call you names and Google-up something to make make me look smart?

To be clear, I never said humidity did not have to be considered when sizing an HVAC system. I only said that air conditioning dries things out, if that makes me a fool so be it.

[Naam]

Is this where I am supposed to call you names and Google-up something to make make me look smart?

To be clear, I never said humidity did not have to be considered when sizing an HVAC system. I only said that air conditioning dries things out, if that makes me a fool so be it.

no diversionary tactics please! there is a big difference between

One big downside to AC is it dries everything out.

and

air conditioning dries things out

Edited June 23, 2015 by Naam

[ericjohnson]

Based on my experience, using the Frigidaire branch is quite reasonable both price and efficiency.

[kokesaat]

A few questions related to both air conditioning and dehumidifying:

 

I have 2 Daikin 18k BTU inverter air conditioners.  When I put either into dehumidifying mode, they seem to extract considerably more moisture from the air than normal air conditioning mode.  I read somewhere that the dehumidifying mode shouldn't be used for long periods of time.

 - If electricity costs are not a concern, what is the potential harm in using the dehumidifying mode for say more than 2 hours a day (especially during rainy season)?  Am I damaging any of the machine's components?

- On most days during the rainy season, I run only one of the ac in dehumidifying mode for about 2 hours in the morning.  I use the air conditioning/cooling mode for about 9 hours each during the remainder of the day/night.  A single unit brings down the humidity level from 70% to about 53% in two hours......600sq feet of floor space.    Would it be more efficient, or perhaps better for the equipment, to run BOTH units in dehumidifying mode for say just 1 hour, instead of a single unit for 2?

 

Any help from the experts is appreciated.

[Pacificperson]

Air conditioners and dehumidifiers have two basic parts: an evaporator which cools and extracts heat from the air and a condenser which expels the heat back into the air. Dehumidifiers have both parts in a single box. The air is passed over the evaporator where it is chilled and the moisture is condensed out of the air. The air is then passed over the condenser and heat is expelled back into the air which reheats it. The net change is lower humidity and slightly warmer air.

 

Air conditioners have the two parts separated. The evaporator is the inside unit and the condenser is the outside unit. By expelling the heat to the outside the building, the air conditioner cools the building.

 

Dehumidification is normally a secondary function of an air conditioner as their design is optimized for cooling. The dry mode of an air conditioner changes the way that it is operated to optimize for dehumidification. Smaller amounts of air are cooled more, so that a greater percentage of the moisture is extracted. This makes sense when the outside temperature is near the set point and the humidity is way too high to be comfortable.

[tifino]

 

I've had my DeLonghi DeHumidifier for 16 years now, and has never missed a beat.

It was bought down in Melbourne, taken and used in Malaysia and Thailand, is back down in Melbourne again.

 

Had long thought of which way to go, when purchasing, but eventually opted to the pure dehumidifier, that has no compromise

 

Missus couldn't understand why it not an aircon, as she only understands the air has to be colder, but I persist in showing that it is better overall to have Dry air passing over you (take the wocka wocka ceing fans, and myriad of deskfans over the world, as the example).

 

The basic thing for your own comfort, is to have lots of moving air around you, to dissipate your own body heat.

 

The extra bonus of the dehumidifier:

is that now spends a lot of it's life in the laundry room, drying the washed clothing,

because it is cold and wet outside at the moment!

 

The only downside of the dehumidifier, indoors, is that it kills the flowers.

Which is too bad, as the dehumidifier actually pumps out enough water from the air, to water all the potplants!!

 

 

Edited September 13, 2016 by tifino

[chiang mai]

The dehumidify option on out seven year old Mitsu. air con units does the job for us, it works extremely well, many people have this option but don't know it exists, shame really.

[Gary A]

From what I have seen over the years here, the Thai installers like to oversize their units. For example,  my condo bedroom had a 12,000 BTU unit. It cooled the room quickly and cycled on and off way too often. The servicemen I had to check out the dead unit (compressor shot) wanted to put in a much larger unit. I didn't argue with them and just sent them on their way.  A smaller unit will dehumidify better because it will have longer cycle times. I haven't replaced that unit yet but will replace the 12,000 with a not larger than a 9,000 or 10,000 BTU unit. Too large a unit will make the air feel cold and clammy encouraging mold.

[evilebxxx]

On ‎6‎/‎22‎/‎2015 at 10:55 AM, Naam said:

in a country like Thailand drying out the air is a desired and huge big advantage called "latent cooling".

i also have a setting on my new samsung air called d light cool does cool and dehumanization of the air much better then the dry mode

[sometimewoodworker]

On 18 September 2016 at 10:53 PM, evilebxxx said:

i also have a setting on my new samsung air called d light cool does cool and dehumanization of the air much better then the dry mode

 

Wow!!! you have a real hate for people 555555

how does it dehumanise the air????! 

 

My my aircons only take the water or heat out?