Split Air con

MrRockliffe said:
Combination of not being powerful enough to overcome the heat in the hotter weather (office had all systems on recently and the room was still 26 degrees), and leaks.


They’ve been pretty unreliable.
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Maybe it's undersized for the building, our office uses a ducted Mitsubishi system that we've had for several years and it doesn't have any issues in summer or winter, keeps the office at 22c year round. I don't know how many external units we have though, I've seen at least 8 big units on the outside but there could be more on the roof

The only issue we have is that the office doesn't have a dedicated server room so we adhoc took over a room but because it wasn't designed as a server room it doesn't have the cooling density to deal with that much heat in a small room so we run an additional portable aircon in there 24/7
 
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MrRockliffe said:
Combination of not being powerful enough to overcome the heat in the hotter weather (office had all systems on recently and the room was still 26 degrees), and leaks.


They’ve been pretty unreliable.
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So they are undersized and not fit for purpose.

And pumps/drains not cleaned out and tested or it’s been installed poorly/incorrectly.
 
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Reuben klang said:
So they are undersized and not fit for purpose.

And pumps/drains not cleaned out and tested or it’s been installed poorly/incorrectly.
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They’re not undersized, they have worked when first installed.

They’re serviced regularly.


They just break constantly (despite being reasonably new - some even brand new).


Can’t comment on installation but we have the same guys who installed other systems in other offices which have been fine.
 
We're getting a split system installed next Saturday, just after another heatwave hits us :D We've had a portable AC for about 10 years now which has helped with the bedroom at night but we're fed up how hot our 2018 build detached house gets and how long it takes to cool down.

We've got a good friend who is an AC engineer by trade and he's charging us £1990 to provide & install a Midea 5Kw outside and 4Kw & 3.5Kw units inside. I'm expecting it to be significantly better than our portable unit and it'll be nice to just be able to get on with life during the day rather than constantly fight a losing battle with the heat.

There was a long wait on the Mitsubishi kit and it was quite a bit more money so I'm hoping the Midea kit is decent!
 
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MrRockliffe said:
They’re not undersized, they have worked when first installed.

They’re serviced regularly.


They just break constantly (despite being reasonably new - some even brand new).


Can’t comment on installation but we have the same guys who installed other systems in other offices which have been fine.
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Has anything else changed? More people, more equipment? If the heat load hasn’t changed, it should still be able to remove the heat. Maybe short of gas.

Unless it’s a heavy industry unit.
 
I've had no issues at all with the mitsubishi hi units that were installed here a few years ago.
My workplace has similar ones in the office that have been problem free too
 
Question on running costs for a split aircon unit.

I have a 2kw system fitted to my garden office. When it was fitted the tech said given the size of the office it would only require 1.2kw to efficiently cool the room. The 2kw unit was the smallest they offered.

I have an app that controls the Aircon, it let me add my electricity price per KW hour. And logs the amount of electric used. Ive had the unit running on eco cool (set to 18degrees) since 10am today , so just over 9hrs. It's saying the unit has only used 52p worth of electric.

Does this sound right? I'd was expecting it to cost more than that to run?
 
Livewire88 said:
Question on running costs for a split aircon unit.

I have a 2kw system fitted to my garden office. When it was fitted the tech said given the size of the office it would only require 1.2kw to efficiently cool the room. The 2kw unit was the smallest they offered.

I have an app that controls the Aircon, it let me add my electricity price per KW hour. And logs the amount of electric used. Ive had the unit running on eco cool (set to 18degrees) since 10am today , so just over 9hrs. It's saying the unit has only used 52p worth of electric.

Does this sound right? I'd was expecting it to cost more than that to run?
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It depends entirely on usage.
As an example, I have a 2 room split, Cheap Electriq model, 2x12000BTU on a single outdoor unit.
On a day like today when i have both indoor units on max all day it draws approx 1-1.2kw/hr
Overnight where I just have the bedroom unit on low fan speed the system draw ramps right down to 200w/hr or so.
 
We moved late last year and I definitely plan on getting an AC system before next year! Was getting quotes from the usual 'all inclusive' places, anything from £3500-£5000 for 1 outdoor unit and 2 indoor units.
Has anyone done a 'hallway' AC unit - so what I mean by that is, there are 4 bedrooms upstairs - but if we have one large unit on the upstairs landing, if all upstairs doors are open, surely it would cool the upstairs well? The idea is to get one on the upstairs landing and one in the lounge downstairs.
(The downstairs one would be easy for installer as its on an outside wall, but the upstairs is internal, so hopefully they would just go up into the loft and down to the side of the house with the external unit, so not much drama hopefully).

We have a few local installers, I would imagine they will be cheaper than the price quoted from the places i've tried (iHeat etc) - I am down South so everything is more expensive!
 
Pulsedriver said:
Has anyone done a 'hallway' AC unit - so what I mean by that is, there are 4 bedrooms upstairs - but if we have one large unit on the upstairs landing, if all upstairs doors are open, surely it would cool the upstairs well? The idea is to get one on the upstairs landing and one in the lounge downstairs.
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I guess it depends on the layout of your upstairs to whether it'll be efficient.
 
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Thinking the wall that backs on to the bathroom so it faces the stairs
 
Pulsedriver said:
We moved late last year and I definitely plan on getting an AC system before next year! Was getting quotes from the usual 'all inclusive' places, anything from £3500-£5000 for 1 outdoor unit and 2 indoor units.
Has anyone done a 'hallway' AC unit - so what I mean by that is, there are 4 bedrooms upstairs - but if we have one large unit on the upstairs landing, if all upstairs doors are open, surely it would cool the upstairs well? The idea is to get one on the upstairs landing and one in the lounge downstairs.
(The downstairs one would be easy for installer as its on an outside wall, but the upstairs is internal, so hopefully they would just go up into the loft and down to the side of the house with the external unit, so not much drama hopefully).

We have a few local installers, I would imagine they will be cheaper than the price quoted from the places i've tried (iHeat etc) - I am down South so everything is more expensive!
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It will do something but you'd be better off targeting 2-3 bedrooms with dedicated units and a single outdoor.

The AC unit takes the air from the top, cools it and blows it out; auto mode won't really work with a single unit on the stairs because the temp trigger won't match what the rooms are - you can obviously override it and set fixed/consistent output but you're still not processing the air in the bedrooms; you'll get some churn but relatively limited. Can't hurt to ask as it will vary based on layout.
 
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Wouldn’t natural convection make fitting split air downstairs a bit excessive? I’ve always found that the downstairs of our house stays nice and cool, it’s just the upstairs that’s like an oven when we get days like this. Our house is a typical 1930’s semi, so I was considering just getting the 3 upstairs bedrooms air conditioned. Descending cold air from those should help take the edge off the downstairs in the evening I would have thought.
 
The Funktopus said:
Wouldn’t natural convection make fitting split air downstairs a bit excessive? I’ve always found that the downstairs of our house stays nice and cool, it’s just the upstairs that’s like an oven when we get days like this. Our house is a typical 1930’s semi, so I was considering just getting the 3 upstairs bedrooms air conditioned. Descending cold air from those should help take the edge off the downstairs in the evening I would have thought.
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Our downstairs still gets pretty hot, especially our kitchen in the afternoon sun. Doesn’t get used much in our lounge that gets the morning sun. If I was doing it again and had the money, I’d do exactly the same and get the whole house done. On a budget, I’d just to our main bedroom.
 
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