Split Air con

I've had 3 quotes for an install in an insulated garden office - around 3m x 3m x3m.

Any recommendations as to which would be best in terms of performance and reliability? The quotes vary from small independent provider, to nationwide. Ideally want to keep costs and noise down, but I am not clear on how much real world difference there will be in the outdoor noise if the external unit is 47dB vs 55dB or 60dB.

QuoteUnitTotal Cost
1Mitsubishi SRK25ZSP£ 1,775.00
2Daikin Perfera 3.5KW£ 1,900.00
3Bosch Climate 3000i 3.5kW£ 2,300.00

Daikin from that list, that mitsubishi is a MHI and it shouldn’t cost that much.
 
Thanks for all the feedback. I did get another quote but that was even higher - not sure if that's just my area [South West].

In terms of noise, the Daikin is loudest, then Bosch and Mitsubishi. Will ponder a bit more before it gets too warm...
 
I just had the first quotes in today for a 4 room split system based around either the Toshiba Haori/Saiya units or the LG Artcool Mirror units. To say I was surprised at how much the quotes have come in at compared to the numbers in this thread is an understatement. £8250 for the Toshiba system, £9250 for the LG. Those quotes exclude the electrical work required to get a 20A fused supply to the installation location as well. This was a smallish local firm - perhaps I would be better off going to a nationwide installer to perhaps leverage their volume discounts a bit?

I can buy the equipment myself for less than half the quoted price. Does anyone have any recommendations/experience of self-installing these systems and then getting an F Gas certified engineer to come and commission it/sign it off afterwards?
 
I just had the first quotes in today for a 4 room split system based around either the Toshiba Haori/Saiya units or the LG Artcool Mirror units. To say I was surprised at how much the quotes have come in at compared to the numbers in this thread is an understatement. £8250 for the Toshiba system, £9250 for the LG. Those quotes exclude the electrical work required to get a 20A fused supply to the installation location as well. This was a smallish local firm - perhaps I would be better off going to a nationwide installer to perhaps leverage their volume discounts a bit?

I can buy the equipment myself for less than half the quoted price. Does anyone have any recommendations/experience of self-installing these systems and then getting an F Gas certified engineer to come and commission it/sign it off afterwards?

London area, high end units, ours worked out at about 2.5k per unit. Electrical on top I think, although that was quite cheap in comparison.
 
I just had the first quotes in today for a 4 room split system based around either the Toshiba Haori/Saiya units or the LG Artcool Mirror units. To say I was surprised at how much the quotes have come in at compared to the numbers in this thread is an understatement. £8250 for the Toshiba system, £9250 for the LG. Those quotes exclude the electrical work required to get a 20A fused supply to the installation location as well. This was a smallish local firm - perhaps I would be better off going to a nationwide installer to perhaps leverage their volume discounts a bit?

I can buy the equipment myself for less than half the quoted price. Does anyone have any recommendations/experience of self-installing these systems and then getting an F Gas certified engineer to come and commission it/sign it off afterwards?

I have experience with self installing (very easy if your system is not too complicated. If the supplied refrigerant charge is sufficient, it's just a case of leak test/pulling a vacuum), not the f-gas sign-off bit though.
I don't think it's something that's recorded in the same way to building control as say an addition of a new electrical circuit or boiler etc is. Possibly warranty implications depending on brand.
Have a look on the f-gas register and call some of the numbers close to you would be my advice.
 
Not split air con, but I bow down to this thing that has surpassed all expectation, taking my gym from 30C to 21C in just over 10 minutes. As long as I stand in the breeze the air temperature doesn’t matter too much anyway.



Most of the time it just runs on the fan, having reached the target temp. Will be interesting in the hottest months.

Interestingly, so far at least, it keeps a more stable temperature than our split air con in the house. It is of course a fair bit louder, mainly because it’s ‘low’ speed fan setting is hilariously high.
 
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Not split air con, but I bow down to this thing that has surpassed all expectation, taking my gym from 30C to 21C in just over 10 minutes. As long as I stand in the breeze the air temperature doesn’t matter too much anyway.



Most of the time it just runs on the fan, having reached the target temp. Will be interesting in the hottest months.

Interestingly, so far at least, it keeps a more stable temperature than our split air con in the house. It is of course a fair bit louder, mainly because it’s ‘low’ speed fan setting is hilariously high.

I had a cheap one which even though made you deaf due to the noise it did do a reasonable job at cooling my bedroom down.
 
Had my system installed 2 months ago and the installation team is just a bit meh, system is now all up and running. I am in Zone 5-6 London and over all about 10k plus £200 for electrics

6 units covering every room in the house except bathrooms, no ducting on show and one bedroom needed its own unit ducted from the loft and outdoor unit. We went for Mitsubishi which was the choice of the installer, no complains except the units have fancy swing up air vent and cover which can be noisy in quiet bedroom.....every time it goes idle it will shut then reopen and the motor noise is annoying.

Bring on the heat wave !
 
I think 2024 is the year we have AC installed in the bedrooms.

Not a huge house, the two rear bedrooms are 2.5m x 3.2m and master bedroom is 4.5m x 3.2m. Ceiling height throughout is 2.8m.

Calculators suggest 4500 BTU for the smaller rooms, and 8000 for larger.

So I'm thinking a dual output system, (9000 BTU x 2, 9000 seems to be the smallest I can find) for the rear bedrooms and a single system (12000 BTU) for the master. Seems better to oversize, it's an Edwardian house and the insulation isn't great anyway.

For the master bedroom and one back bedroom, the indoor unit can easily go on the external (gable) wall. For the other bedroom it would need to go on the party wall. My expectation there is the pipework can be run up the (gable) side of the house with the pipes for the other rooms and then through the loft to the party wall.

Consumer unit is under the stairs, this is part of the dining room and that has a suspended timber floor. The dining room wall is the gable end of the house. There is space at the side of the house to fit the external units, with 2.5m between our house and our neighbours - there's no fence or wall dividing that.

Is there any advantage to mounting them off the floor?

I'm going to contact local (Manchester) installers next week to get quotes, but wanted to see if anyone with experience of the process can see anything I've missed or glaring errors in my assumptions.

Whatever brand we go with, it needs to look nice, be quiet (as bedrooms) but also I want decent smart / Home Assistant integration (we have Nest doing the boiler.. do any interface with that so it all works as one?) as I've no desire to be faffing with little IR remotes.
 
no complains except the units have fancy swing up air vent and cover which can be noisy in quiet bedroom.....every time it goes idle it will shut then reopen and the motor noise is annoying.

that sounds super annoying, I can deal with continuous noise when asleep - but things changing like that would jar me. Can you not disable that function, so the fans still blow but the external compressor is off?
 
Chaps,

What would you suggest for a garden room? It'll be fully insulated - 100mm PIR floor/ceiling and 50mm walls. I have loads of space all around the building, and lots of wall space.

Do they heat as well?
 
Chaps,

What would you suggest for a garden room? It'll be fully insulated - 100mm PIR floor/ceiling and 50mm walls. I have loads of space all around the building, and lots of wall space.

Do they heat as well?

Yes, they heat too. I’d definitely recommend a split system, probably just a 2.5kw system.
 
Yes, they heat too. I’d definitely recommend a split system, probably just a 2.5kw system.
Brill thank you. I didn't even know what to put into Google but this first result seems pretty spot on?
 
2.5kw is probably overkill - my whole house is under 6 and it’s not as well insulated as that!

@dlockers put your building into the heat punk website and do a proper heat loss calculation.

Edit: look at something like this which is ‘easy fit’, no F-Gas cert required (aka DIY) which is more your style.

 
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2.5kw is probably overkill - my whole house is under 6 and it’s not as well insulated as that!

@dlockers put your building into the heat punk website and do a proper heat loss calculation.

Edit: look at something like this which is ‘easy fit’, no F-Gas cert required (aka DIY) which is more your style.


Probably overkill, yes, but I’d rather overspec for the hottest days.
 
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