Air conditioning - Any recommendations please?? - Part 2

[007Mi6]

Yes. Home office / Study area within living room. Exploring a half height partition wall with a foldable (upwards or bifold) glass.

To cool the entire living room with a 22-24k btu will consume quite a significant amount of electricity. So I wanted to explore the idea of having 2 units, 1 x 9k for the small study area and 1 x 18k for the remaining common living room area.

The length wise of the living room windows is so long that it is hard to add a door to conceal the opening to the study room. So probably might have to consider having it open as it is. One option probably is to install a corner fan to blow the air backwards (towards the FCU direction) where the 2 standing desks will be.

In terms of System configuration, looking at either System 4 / 5, or System 2 + 2 or 2 + 3. Trunking and all will also be a consideration since more FCUs means more piping and the trunking can be unsightly for so many pipes.

Need AC installer to advise before committing to purchase but somehow it's a chicken and egg situation where you only meet installer after you purchase the AC. And most salesman in departmental stores are not the best person to advise on how to plan.

Actually not true. Even after I bought from GC; I paid one installer for site survey and got another site surveyor to take a look and advise.

But may I confirm if your 4rm is 3 bedrooms plus living plus study needs to have cooling? Dining no need? If this is so, personally I would prefer 4+1 with the System 1 being in the study. Reason is living and study may use at the same time. System 1 would be more efficient compared to System 3/4 with 1 FCU running.

 

[007Mi6]

4+1 would be more feasible and cost saving provided living and bedrooms don’t use at the same time.
3+2 would probably cost $6000-$6200, 4+1 I can probably get it at $5k to $5.2k

you also need to give the condenser unit a rest. If you pair 3+2 and ends up living plus study both on at the same time, might struggle.

review your usage and see if my suggestions are practical to you

 

[mark lim]

Actually not true. Even after I bought from GC; I paid one installer for site survey and got another site surveyor to take a look and advise.

But may I confirm if your 4rm is 3 bedrooms plus living plus study needs to have cooling? Dining no need? If this is so, personally I would prefer 4+1 with the System 1 being in the study. Reason is living and study may use at the same time. System 1 would be more efficient compared to System 3/4 with 1 FCU running.

it is marginal diff. sys1 with GP10VF is 2.5kw cooling with 0.51kw consumption. 3H28 with 10k btu FCU with 2.8kw cooling is 0.62kw consumption. if you normalise it to 2.5kw cooling then it will be 0.55 which is a 0.04kw diff or 40watts.

 

[ZacharyA]

you can get a rough gauge of prices of system 5 vs system2 +sys3 on coolserve. this is what i use when roughly comparing equipment cost. for sure it is not worth it to go for a system5. i only see all negatives unless one is restricted by only one compressor and nothing else but 1 compressor. then you go for this option.

Yes, price wise not that significant. Sys 5 easily high 6k to 7k. 2 Sys 2 + 3 is about 2k++ and 3k++ so add up also not far off.

 

[ZacharyA]

4+1 would be more feasible and cost saving provided living and bedrooms don’t use at the same time.
3+2 would probably cost $6000-$6200, 4+1 I can probably get it at $5k to $5.2k

you also need to give the condenser unit a rest. If you pair 3+2 and ends up living plus study both on at the same time, might struggle.

review your usage and see if my suggestions are practical to you

I didn't know that 4+1 and 3+2 will have quite significant in terms of costs.

My permutation (initially) was based on Sys 2 (9+18) Master and Living, which is highly likely won't be using concurrently.

And then Sys 3 (9,9,9) for 2 common room and study area in living room. But I will also consider the 4+1 approach.

My dining area will be part of the living room, with TV and sofa. Which occupies about 2/3 to 3/4 of the 5m by 6m squarish configuration.

Study area only a very small maybe 3m by 1.5-1.8m configuration (2 standing desks of 1.2m - 1.5m width)

I will try to find a way to upload floor plan.

 

[obichacha]

System 5, make sure your outdoor isolator is able to support more than 20A.
And also your common usage , isn’t on 2/3 room or just on living and kitchen.
Night time using bedroom only. Like that the compressor seem like overwork and killing lifespan

 

[ZacharyA]

@007Mi6 , this is the floor plan. Bedrooms is quite straightforward, nothing to shout about.

It's more of the living room area. Ideally I want to have 2 units so that I can just cool the study area without blasting the entire 24k FCU for whole living space (if doing without partition).

But the opening of the study area makes it challenging to mount a door of sorts due to the long living room windows all the way to near the entrance. Which is why I thought maybe I just leave it open, and install a corner fan above near the main door area and blowing backwards the cool air towards the inner part of the study area.

Not the best solution but beats cooling the entire area or just let the cold air "slips" towards the living area through the front foyer?


Another position I can think of to mount the living room FCU is via the master bedroom above the TV area, blowing downwards to dining + sofa. I will also have a ceiling fan in the middle to create ventilation.

 

[obichacha]

@007Mi6 , this is the floor plan. Bedrooms is quite straightforward, nothing to shout about.

It's more of the living room area. Ideally I want to have 2 units so that I can just cool the study area without blasting the entire 24k FCU for whole living space (if doing without partition).

But the opening of the study area makes it challenging to mount a door of sorts due to the long living room windows all the way to near the entrance. Which is why I thought maybe I just leave it open, and install a corner fan above near the main door area and blowing backwards the cool air towards the inner part of the study area.

Not the best solution but beats cooling the entire area or just let the cold air "slips" towards the living area through the front foyer?

your floor layout not consider wider , 10x3 + 24 or 18k on living + dining area
Old flat without aircon ledge , not possible to get system 5. That is Hdb requirements

 

[007Mi6]

@007Mi6 , this is the floor plan. Bedrooms is quite straightforward, nothing to shout about.

It's more of the living room area. Ideally I want to have 2 units so that I can just cool the study area without blasting the entire 24k FCU for whole living space (if doing without partition).

But the opening of the study area makes it challenging to mount a door of sorts due to the long living room windows all the way to near the entrance. Which is why I thought maybe I just leave it open, and install a corner fan above near the main door area and blowing backwards the cool air towards the inner part of the study area.

Not the best solution but beats cooling the entire area or just let the cold air "slips" towards the living area through the front foyer?


Another position I can think of to mount the living room FCU is via the master bedroom above the TV area, blowing downwards to dining + sofa. I will also have a ceiling fan in the middle to create ventilation.

reply you tonight with my view when I am more available.

 

[ZacharyA]

4+1 would be more feasible and cost saving provided living and bedrooms don’t use at the same time.
3+2 would probably cost $6000-$6200, 4+1 I can probably get it at $5k to $5.2k

you also need to give the condenser unit a rest. If you pair 3+2 and ends up living plus study both on at the same time, might struggle.

review your usage and see if my suggestions are practical to you

Just checked Gain City price for 3+1, it costs close to 6k already.

https://www.gaincity.com/mitsubishi-system-1-aircon-muygp18vf-msygp18vf-t0158578
https://www.gaincity.com/product/108519/sku/

 

[mark lim]

@007Mi6 , this is the floor plan. Bedrooms is quite straightforward, nothing to shout about.

It's more of the living room area. Ideally I want to have 2 units so that I can just cool the study area without blasting the entire 24k FCU for whole living space (if doing without partition).

But the opening of the study area makes it challenging to mount a door of sorts due to the long living room windows all the way to near the entrance. Which is why I thought maybe I just leave it open, and install a corner fan above near the main door area and blowing backwards the cool air towards the inner part of the study area.

Not the best solution but beats cooling the entire area or just let the cold air "slips" towards the living area through the front foyer?


Another position I can think of to mount the living room FCU is via the master bedroom above the TV area, blowing downwards to dining + sofa. I will also have a ceiling fan in the middle to create ventilation.

ah stand ard design.
1. doesnt make sense for master to have the FCU sited there. just put it over the window. short pipe runs and still blowing at the bed. bed3 also at window
2. i would place the living FCU at the TV wall. unless your TV is wall mounted and fixed, then maybe avoid that area. reason being shorter pipe lengths and FCU blowing at sofa.
3. bed 2. i would place the FCU above the door. room is small and still can blow at the bed. avoid the trunking along the wall.
4. for the study not sure how to aircon. it is such an odd area. i think the 18k at living is good enough. then use fan to blow. not sure, just think the odd location of study make the aircon placement more difficult. you have a super long pipes to the compressor and drainage.

 

[obichacha]

ah stand ard design.
1. doesnt make sense for master to have the FCU sited there. just put it over the window. short pipe runs and still blowing at the bed. bed3 also at window
2. i would place the living FCU at the TV wall. unless your TV is wall mounted and fixed, then maybe avoid that area. reason being shorter pipe lengths and FCU blowing at sofa.
3. bed 2. i would place the FCU above the door. room is small and still can blow at the bed. avoid the trunking along the wall.
4. for the study not sure how to aircon. it is such an odd area. i think the 18k at living is good enough. then use fan to blow. not sure, just think the odd location of study make the aircon placement more difficult. you have a super long pipes to the compressor and drainage.

maybe his wall all the way up to ceiling, yes place 18k on living and use any stand fan , easy to blow in cooling air.

 

[mark lim]

if you put a wall up. then the living will be perpetually dark.

 

[obichacha]

Maybe the window along the corridor.
Interesting

 

[ZacharyA]

Actually considering the wind and sun direction. The only time the study area will feel hot would likely be during the December period, where AC will come in handy.

Depending on the ID quote on the partition and glassworks, I might just do without it and use a high capacity FCU to cool the entire living area. Need to work out the calculation on how much energy it will consume first.

This is a horizontal block. So no direct East / West sun.

 

[obichacha]

@ZacharyA​

System 4, 24k on living confirm very sufficient to coverage living and study room.

my house system 3, sometime very hot at around 3pm , I switch on 18k with ceiling fan on living room, able to cover the hatching area from the floor layout plan.
I don’t think your can’t cover.

 

[mark lim]

@ZacharyA
you should also run the pipes just above the floor in bed3 to the FCU in Bed2 and Living, also can have a larger trunking and since at lower lever also not so unsightly. . main reason is to have a drop in height from the FCU to prevent drain pipe blockages and water back flow.

 

[networked]

for everyone benefit, i have upgraded from 9 btu to 12 btu for mbr. I think the cooling is indeed faster but it comes at a cost for power consumpton 12 btu to 9 btu is about 0.7 kW more. Maybe it will save some electricty since set temp 26 cel is acheived faster than a regular 9 btu. But confort level and experience is def better. it used to take around 15 mins to cool the mbr and now takes about 10 mins based on my estimation.

 

[obichacha]

for everyone benefit, i have upgraded from 9 btu to 12 btu for mbr. I think the cooling is indeed faster but it comes at a cost for power consumpton 12 btu to 9 btu is about 0.7 kW more. Maybe it will save some electricty since set temp 26 cel is acheived faster than a regular 9 btu. But confort level and experience is def better. it used to take around 15 mins to cool the mbr and now takes about 10 mins based on my estimation.

your 9k Btu remote control have powerful mode?
Single button should cooling down faster , after few minutes and back to normal setting

 

[obichacha]

Few thing to plan, before you get installation on 12k BTU for master bedroom.