Fitted Air conditioning

[Condi]

As above, it depends on the install really.

Quotes for 3 rooms 2 x 2Kw units and 1 x 1.5Kw unit, all connected to a single external compressor about £3.6k excluding electrics. Mitsubishi Electric AP indoor units. 2 of the internal units are super easy, back to back wall with the compressor albeit compressor mounted at head height and the 2 indoor units on the first floor, the 3rd is a bit more difficult with pipes running in the loft and a condensate pump needed.

If you need to have scaffolding that will add another £300-£400, and if there is any internal routing or making good required that will obviously push up the price.

Do you want/need 2 compressor units? A larger single unit will be cheaper.

[CorradoTDI]

FishAndChips said:

Anyone have experience of Daikin Perfera units? Presumably anything Daikin is going to be decent? Just had a quote of £7k for an install to cover 3 rooms, 2 x inverter outdoor units (2.5kW & 3.5kW) and 3 x indoor mounted units. Seem reasonable, or toppy?

Sounds very high although it's a top brand and obvioulsy depends on many factors... shop around if you can though as one of my Quotes was over double the one I went for for exactly the same kit - based on the work that was done, those installers would have been on over £1000 a day had I gone with them!

Also worth updating your profile witha location so people can recommend installers.

[bogie]

FishAndChips said:

Anyone have experience of Daikin Perfera units? Presumably anything Daikin is going to be decent? Just had a quote of £7k for an install to cover 3 rooms, 2 x inverter outdoor units (2.5kW & 3.5kW) and 3 x indoor mounted units. Seem reasonable, or toppy?

Sounds a bit high but depends where you live and how easy to install....and how those Daikin units price up against Mitsubishi units.

We are in NE Midlands, we had 3 indoor units from 2 external units fitted last year. Mitsubishi "premium" range and it was £3400 they were here 1 1/2 days. 1 wall unit outside feeding both an upstairs and downstairs room above and separate external unit on ground floor feeding a ground floor room.

Edited by bogie on Saturday 4th March 17:44

[Grumps.]

I bought a multi split daikin with a 5kw outdoor and 2 x 2.5kw indoor units for a shade under £2k

Local guy came and fitted it all for £500 including pipework, fittings brackets etc.

[FishAndChips]

Thanks again all. I'm in Surrey (KT10) and profile updated.

Electricty wise, the quote includes £400 provision for installation but we have points where needed already as I had them installed when we recently extended. The engineer also said the install is relatively straightforward as there is decent access, and location to install the external unit. No scaffolding required.

The other point to note is one of the units needs to be commercial grade supposedly, as we have a large open plan living area that needs to be cooled. So below are the measurements.

(Room 1 & 2 serviced from the same external unit)

Room 1: ~57sqm (600sqft)
Room 2: ~15sqm (160sqft)

Room 3 (separate unit): 15sqm (160sqft)

If anyone has any recommendations for installers covering KT10 then pls post. Thank you.

[thebraketester]

Temcon Air Conditioning.

He came to us in Hertfordshire and was very good. Price was right too.

[Condi]

Can anyone tell me the difference between Mitsubishi Electric and Mitsubishi Heavy Industries, and which (if any) are better? I've had a few quotes, all Mitsubishi, but the last one has quoted for Mitsubishi HI rather than Electric! Is there any benefit to going for one over the other? You would expect the internals to be similar and all built in the same factory, but knowing these Japanese conglomerates like I do it is not guaranteed.

[Shiv_P]

Condi said:

Can anyone tell me the difference between Mitsubishi Electric and Mitsubishi Heavy Industries, and which (if any) are better? I've had a few quotes, all Mitsubishi, but the last one has quoted for Mitsubishi HI rather than Electric! Is there any benefit to going for one over the other? You would expect the internals to be similar and all built in the same factory, but knowing these Japanese conglomerates like I do it is not guaranteed.

Which series was the Mitsu Electric? LN?

[LastPoster]

I have been out of the trade a while but HI and E always used to be separate operations with entirely different products. Electric being superior and alongside Daikin just about the best you can buy

[CharlesElliott]

I am in KT12 and have a couple of recommendations but as they both quoted close to 10K for 4 internal units (3 wall mounted, one floor mounted and hidden) spread across 2 compressors you may not want to know! All Daikin. But they did a good job, built a custom plenum for the floor mounted unit and we went with 'Stylish' wall units which are at the top end of the range.

[Condi]

Shiv_P said:

Which series was the Mitsu Electric? LN?

Erm, no...

MSZ-AP internal units
MXZ-3F external unit.

MHI units;

SKM25ZSP internals
SCM50ZS external

My understanding was Mitsubishi Electric were pretty good, but the inclusion of the MHI option threw me a bit. One of the ME quotes has been very competitive so will go with them.

[GT89]

Has anyone fitted the systems from Appliances Direct, I've seen there split x2 12000btu system from one external unit.
It all seems pretty decent. When it comes to connecting it up to the electrics, what connection do they require ?

[surveyor]

GT89 said:

Has anyone fitted the systems from Appliances Direct, I've seen there split x2 12000btu system from one external unit.
It all seems pretty decent. When it comes to connecting it up to the electrics, what connection do they require ?

I did. They will need an approved installers name. They give you a list to choose one. No one checks
.
I think the twin splits need an external supply. Ideally it should be a separate circuit. Ours is a single split and runs off a spur quite happily.

It’s a cheap system and when it dies it will probably need to be replaced rather than repaired. I just accepted it.

[Condi]

GT89 said:

Has anyone fitted the systems from Appliances Direct, I've seen there split x2 12000btu system from one external unit.
It all seems pretty decent. When it comes to connecting it up to the electrics, what connection do they require ?

It will say in the specs but for a double split then likely a dedicated 16amp or 25amp supply. I think by the rules you should be able to isolate it individually, so you nearly always see air con units with their own isolator box.

[Evanivitch]

What sort of COP are you expecting/experiencing on heating with these units? Certainly tempted to make the move on these units, in lieu of a full gas boiler replacement, but with electricity prices as they are is there a financial benefit on the heating side?

[FishAndChips]

Can an air source heat pumps unit effectively act as the only source of heat for a room? Im installing in a garden office build, which will be well insulated, and considering this as the only source of heat (I have the option of installing electric radiator also).

[Shnozz]

FishAndChips said:

Can an air source heat pumps unit effectively act as the only source of heat for a room? Im installing in a garden office build, which will be well insulated, and considering this as the only source of heat (I have the option of installing electric radiator also).

See the post immediately before. Seems if outside temperature gets to a certain point they will struggle to produce any tangible benefit.

I use air con inverter units as my only heat source for bedrooms and office in Spain and it’s fine, but temperatures never really go lower than low positive Celsius. Research on using similar in the U.K. suggests when it’s really needed on properly cold spells it wouldn’t be up to the job.

[DaveCWK]

GT89 said:

Has anyone fitted the systems from Appliances Direct, I've seen there split x2 12000btu system from one external unit.
It all seems pretty decent. When it comes to connecting it up to the electrics, what connection do they require ?

Yes I have that exact one (Electriq 2x12000btu) and its fine. Ultimate pefrormance on the hottest days isn't as good as say 2 fully separate 12000btu Mitsubishi units or similar would be, but for the price you really can't complain. The units are quiet and the app works. Electric feed is a 2.5mm cable fed from a 16A MCB in consumer unit.

[Pheo]

Shnozz said:

See the post immediately before. Seems if outside temperature gets to a certain point they will struggle to produce any tangible benefit.

I use air con inverter units as my only heat source for bedrooms and office in Spain and it’s fine, but temperatures never really go lower than low positive Celsius. Research on using similar in the U.K. suggests when it’s really needed on properly cold spells it wouldn’t be up to the job.

Sorry don’t agree with that - yes they may need to run a defrost cycle, but it’s not that arduous. They work harder in colder weather and the COP comes down but so does all heating.

I have found this winter even with the big drops, the garden room is so well insulated and air tight that o can run it overnight on my cheap rate for 4 hours and this will last the whole day on all but the coldest. Even if you do need the unit on, it’s then not icing up because it’s not working very hard (all about temp differential).

Also, cooling in summer is awesome and needed!

[SoliD]

FishAndChips said:

Can an air source heat pumps unit effectively act as the only source of heat for a room? Im installing in a garden office build, which will be well insulated, and considering this as the only source of heat (I have the option of installing electric radiator also).

Down on the south coast we have an outside office and use the AC unit year round for heating cooling. Gets the 3x3 box up to temp within 10minutes even during that cold snap last year.