Split Air con

Emailed a few companies, but all are super busy (shock) but I was only trying to see how they deal with tiled walls and AC ducting.
Anyone have a split system and a house like mine.
Was thinking one up to bedroom and one round to the living room.
Any photos appreciated.

 
Not only are they busy with installations, but for the second phase of our our install that fell in July, they were inundated with systems that were failing during the heatwave.

That does work though. London area, ours were 2.5k a unit years ago.
 
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I wouldn't entertain the idea of getting a split AC quote, etc., now.

If I recall, I had mine installed for the home office in February a few years ago. Better to look into this during winter when demand will be lower and availability will be better.
 
rodders said:
Emailed a few companies, but all are super busy (shock) but I was only trying to see how they deal with tiled walls and AC ducting.
Anyone have a split system and a house like mine.
Was thinking one up to bedroom and one round to the living room.
Any photos appreciated.

Click to expand...

When I was getting quotes, fitters refused to drill through tiling like that on our house. They only offered to go into the attic space and install ceiling units instead.
 
ci_newman said:
When I was getting quotes, fitters refused to drill through tiling like that on our house. They only offered to go into the attic space and install ceiling units instead.
Click to expand...

That's a bit crap, I get that they are not roofers or whatever, they are AC installation technicians, so not their trade but you’d think they'd just remove a tile and go straight though the wall, and have it written into the deal the homeowner is responsible for making good the entry point afterwards
 
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mattyfez said:
That's a bit crap, I get that they are not roofers or whatever, they are AC installation technicians, so not their trade but you’d think they'd just remove a tile and go straight though the wall, and have it written into the deal the homeowner is responsible for making good the entry point afterwards
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It's more than one tile though, they'd need to remove an entire strip to mount the ducting / pipework which would likely be very difficult to "make good" again afterwards. In that example photo above, the entire column of tiles would have to be removed to allow them to affix the ducting properly. It's pretty difficult to figure out which tiles would need to be removed for the coring too as they'd likely drill from the inside going out.
 
ci_newman said:
It's more than one tile though, they'd need to remove an entire strip to mount the ducting / pipework which would likely be very difficult to "make good" again afterwards. In that example photo above, the entire column of tiles would have to be removed to allow them to affix the ducting properly. It's pretty difficult to figure out which tiles would need to be removed for the coring too as they'd likely drill from the inside going out.
Click to expand...


Ahh fair enough... That's a bigger job then lol!

I was thinking they could run the hose for the upstairs in the cavity wall but I guess that's a can of worms too.
 
I'm guessing it's best to have pipework as short as possible especially outside in the sun.
I wonder where they'd even put an outside unit on my house without it being in the way or some crazy length to the pipework. Side of the house would be best but that's over the garage roof (tiled sloped roof).
 
I've asked for a quote to install AC in two bedrooms. They are the ones on the top floor (3-storey house).

Fully expecting to have to bend over when the quote comes in. Hoping no more than £6k, but this is 2026 after all :(
 
glenimp617 said:
I've asked for a quote to install AC in two bedrooms. They are the ones on the top floor (3-storey house).

Fully expecting to have to bend over when the quote comes in. Hoping no more than £6k, but this is 2026 after all :(
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Last time I looked a couple of years ago it was basically 1k for the external then 1k for each indoor unit. I really wanted to wait until I could get it in each room but I just want the bedrooms done now, look at doing it next spring.
 
robj20 said:
Last time I looked a couple of years ago it was basically 1k for the external then 1k for each indoor unit. I really wanted to wait until I could get it in each room but I just want the bedrooms done now, look at doing it next spring.
Click to expand...

and then I assume the same again for installation?
 
LiE said:
Next quote, based on a single 10kW unit. This one includes electrical work. I've asked the first company to re-quote based on a single unit setup so I can compare. First company doesn't include any electrical work, which is a faff.

Option 1 – Mitsubishi Premium With WIFI

Master Bedroom – 2kw Wall Mounted Unit
Sons Bedroom – 2kw Wall Mounted Unit
Kitchen Area – 5kw Wall Mounted Unit
Living Room – 3.5kw Wall Mounted Unit
1 Outdoor Condenser - SCM100ZS-W

Total - £6527.00

Indoor units are the SRK-ZS-WF range.

The 10kW unit is a big boy.

SCM100ZS-W - MHIAE

Air Conditioning - Multi Outdoor Unit RAC - Outdoor Unit
mhiae.com mhiae.com

The indoor units look pretty nice.

SRK20ZS-WF - MHIAE

Air Conditioning - Multi Indoor Unit RAC - Indoor Unit, Wall Mounted
mhiae.com mhiae.com
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Booked in for 15th July, sooner if they finish jobs quicker.
 
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Is it possible to add extra room units to an existing install later on or would that require an extra external unit?

e.g. if I got the 2x bedrooms done and then added the living room 6 months later - Do I need an extra outside unit (whatever they are called) or can I add it to the existing unit, assuming that it is specced to run 3x units in the first place of course.
 
Richie said:
Is it possible to add extra room units to an existing install later on or would that require an extra external unit?

e.g. if I got the 2x bedrooms done and then added the living room 6 months later - Do I need an extra outside unit (whatever they are called) or can I add it to the existing unit, assuming that it is specced to run 3x units in the first place of course.
Click to expand...

An external unit has max number of ports. I believe you can add more later if you have space. The 10kW I’m getting has 5 ports, I’m only using 4 for the install.
 
ci_newman said:
When I was getting quotes, fitters refused to drill through tiling like that on our house. They only offered to go into the attic space and install ceiling units instead.
Click to expand...
This is what I was expecting.
But getting down to the living room would be difficult.
I thought remove a load of tiles and run behind that, but they'd probably be funny about it. Getting roofers involved would just increase costs.
I hate the tiles! Lol

Probably not going to worth it in the end then.
Though I guess could forgo the living room and just do all 3 bedrooms with a loft unit.
 
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LiE said:
An external unit has max number of ports. I believe you can add more later if you have space. The 10kW I’m getting has 5 ports, I’m only using 4 for the install.
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Cheers... I wasn't sure how they worked i.e. was it number of units or was it over capacity e.g. 30,000 BTU so can take any number of units upto a combined 30,000 BTU.
 
Richie said:
Cheers... I wasn't sure how they worked i.e. was it number of units or was it over capacity e.g. 30,000 BTU so can take any number of units upto a combined 30,000 BTU.
Click to expand...

The multi-split units have a capacity rating that is higher than the nominal rating. eg. a 10 kW outdoor unit can probably have ~15 kW of indoor units connected to it. Obviously, you can't exceed the real capacity of the outdoor unit when it comes to cooling output, but it allows you to optimise indoor unit capacity since not all rooms are hot at the same times of the day with sun movement/etc.


Then you have the port counts discussed above, you need enough ports for your indoor units to connect to. You can upsize in advance, but that can have downsides. For example, on the system LiE posted, the 5 port unit is less efficient running 4 units than the 4 port outdoor unit is, so objectively the 5 port unit is just worse, with the exception of that future flexibility. You need to think hard about if any extra ports will be used though, otherwise you just end up fitting a more expensive and less efficient outdoor unit for no reason.
 
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robj20 said:
Has anyone only fitted AC to their bedrooms and are happy with the choice?
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Depends on your needs. We only did the top floor i.e. the bedrooms as downstairs doesn't get as hot so it's manageable. One of the bedrooms is an office so having a comfortable working space and sleeping space was the priority.

Will maybe do downstairs in the future but relatively indifferent to it. Doing upstairs was 100000% worth it though. Keep in mind that they do heating too, which is helpful for targeted heating in winter.
 
No need for heating the boiler does the job. Bedtime is the only time heat really bothers me, downstairs is fine with a fan.
 
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