Air conditioning

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Air conditioning

Postby Burgerman » 15 Jul 2022, 12:47

Been considering it for years. Its likely to exceed 38 degrees in the UK on mon/tuesday. I cannot cope with that! It causes me all kinds of problems. In addition it works as a very efficient heater that also reduces humidity in winter. Giving out MORE KW of heat than it costs to run.

So that in summer I can cool my bedroom/workshop (yes its the same thing!)
In winter I can background heat the house to say 16 degrees with the normal central heating system, 12 hours a day. At night I can only heat my room instead of the whole house. And do so cheaply. And remove any humidity at the same time.

Now you can buy cheap pre gassed 2 part systems cheaply. They only need connectong together with the inside/outside via a hole in the wall (core drill) and a electrical connection. So easy to DIY.

I am looking at a small cheap to run heat/cooling system like these:

https://www.aircondirect.co.uk/p/156135 ... s-pipe-kit
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Re: Air conditioning

Postby shirley_hkg » 15 Jul 2022, 14:28


Heat pump may not work in extreme cold weather.

I installed a floor standing model. It only cools the lower part of the room , leaving the hot air on top untouched. In heating , it always sucks in the coldest air from below.

Small unit is wall mounted mostly.
It will be more comfortable and energy saving, if you install the indoor unit closer to the floor, say at waist line. Otherwise, I will still have cold feet while the aircon running all day long.
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Re: Air conditioning

Postby Burgerman » 15 Jul 2022, 19:21

Yes. I actually wanted it at high level blowing downwards. Maybe rethink.
We dont really get extreme cold here. Or extreme warmth. Other than the very occasional couple of days.
They say tueseday MAY reach 40C which will break records here. But it wont likely happen...

In winter theres few days that are really below freezing.
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Re: Air conditioning

Postby daveonwheels » 15 Jul 2022, 19:45

where i live its 35-40C for 3 months every day. i do not have AC. dont need it,dont want it. toughen up! i did. [im 66 btw] and yes, its hot
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Re: Air conditioning

Postby Burgerman » 15 Jul 2022, 20:08

But you live in a dry place. So your natural cooling system works. When its green and got humidity is like a tropical jungle. You dont cool as sweat doesent evaporate. Instead you slowly cook in it. And things like ileostomy appliances or convenes do not stay on... Its not about toughening up.
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Re: Air conditioning

Postby daveonwheels » 16 Jul 2022, 13:47

i do not slowly cook. im quite fine. its quite different than england tho. and my house is at 5325 feet.you should be aware that most of new mexico is either lower...texas side... or HIGHER ...7000 feet plus. plus a few 14000 foot peaks,well 1 haha.and a dormant super volcano. sorry to hear that your stuff is getting unglued tho.thats a problem in your case
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Re: Air conditioning

Postby Bubbernator » 17 Jul 2022, 03:09

I spent some time looking at the split systems when considering a retrofit on a 110 year old house that was set up for coal fireplaces.
I was basically told the same thing Shirley said: Great in the summer, not so much in the winter (if the temp. goes below 0*C).
It's a very efficient heat pump system (compare SEER ratings with a central system) so if you don't often get below freezing in the winter it's probably a good option.
A ceiling fan can fix any issues of warm/cold air distribution.
Just make sure to correctly size the unit for the space you're cooling. There's a formula for it that I've since forgotten.
Home insulation is also a factor to consider.
I've seen Double, Triple and even Quad systems set up to all run off one compressor unit.
Makes sense to only heat and cool the spaces that you are occupying.
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Re: Air conditioning

Postby fishinjunky » 18 Jul 2022, 13:42

Temperature regulation is a pain in the ass. In the summer I have a really hard time with heat it causes me to lose my vision an pass out. Then in winter I have a portable heater in my face most of the day.
When I over heat an my vision goes out an I get really dizzy an pass out. Do you think that it's Autonomic Dysreflexia symptoms because of overheating ?
Do you get those symptoms when you overheat?
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Re: Air conditioning

Postby daveonwheels » 18 Jul 2022, 15:59

i do not but i dont have a SCI
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Re: Air conditioning

Postby Scooterman » 18 Jul 2022, 17:38

What about the ol' fan blowing over block of ice trick?

Or a water filled inner tube placed in freezer then worn as a neckless?
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Re: Air conditioning

Postby Burgerman » 18 Jul 2022, 18:49

I think it works so badly that its a waste of time. Air con is the way to go.
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Re: Air conditioning

Postby Scooterman » 18 Jul 2022, 21:56

Perhaps you could get a grant from the local council on health grounds? It's not right that you should have to endure this heat, it's bad enough for able bodied people. They should pay to install air con for you.

I at least have the benefit of limited physical mobility and am lightweight . And even I think it's been hellishly hot today, and tomorrow is supposed to worse!!! :cussing
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Re: Air conditioning

Postby F3Head » 19 Jul 2022, 00:01

I've had a few of these types of portable units. Noise is a major problem with most of them. It will drive you nuts if you have to use it a lot.
I have a Sharp 10,000 BTU unit it's been terrific. It's quiet mostly and chills the room pretty quickly and holds an accurate temperature. My experience has been buy a larger unit than you think you need. Manufacturers are notoriously false advertisers on these things.

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Re: Air conditioning

Postby snaker » 19 Jul 2022, 03:17

For air conditioner, pick Toshiba or Panasonic. I agree to choose more power than needed as manufacturers always lie about real power. E.g if they claim 12000BTU, it's in fact only 9000BTU.
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Re: Air conditioning

Postby shirley_hkg » 20 Jul 2022, 16:21


Small unit is more efficient , and less stops and starts , so more comfortable.

Daikin if you can afford one , or chinese GREE otherwise .
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Re: Air conditioning

Postby Burgerman » 27 Jul 2022, 14:14

Been looking at air con in detail for weeks. Ordered a super efficient one.

EER/COP is a measure that you can use to compare the heat and cooling efficiency of different units. And there are vast differences even on almost identical appering models. From 2 to 5.6. That affects the bills directly.

And so I compared efficiency of heat pumps a lot. And I also wanted quiet, self cleaning, 7 year warranty, many automated controls so it turns itself off or to low cooling and warming when no people around etc.

Cooling on the best, that I ordered has a very high x 5.68 (a 568% efficiency level) or gain. Which means that for every 1kwh you put in you get 5.68kwh of cooling out. That seems non intuitive doesent it! But its true.

Heating. Likewise I will get 5.42 kwh of heating energy out. While feeding 1kwh in. A 542% efficiency lvel. Again a win of around five and a half times more energy out than you pay for.


So this isnt quite as cheap as a £450 split unit. About double that plus fitting... But the difference is pretty high in warranty, efficiency, sound levels, reliability and a bunch of other things.

Have a scroll down! https://www.orionairsales.co.uk/mitsubi ... 1145-p.asp

So its about to be fitted. By an "expert"... No DIY!
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Re: Air conditioning

Postby Burgerman » 14 Aug 2022, 20:50

Also, it is bigger than needed. this room is well insulated. But it doesent turn on or off. It throttles. The compressor, the fans and everything just reduce power and slow as rquired. So it frequently runs with just a few tens of watts to maintain the temperature. So also super quiet.
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Re: Air conditioning

Postby Burgerman » 17 Aug 2022, 19:59

Just in case ayone cares.

Indoor unit SRK25ZSX-W
Outdoor init SRC25ZSX-W

Refrigerant R32

HEATING MODE -10C
SCOP 5.2
Energy Efficiency class A+++
Design load (PDESIGNH) 3kW @ -10C
Declared Capacity @ 3kW @-10C
Energy input 40W to 660W variable depending on load.

HEATING MODE 2C
SCOP 6.6
Energy Efficeincy Class A+++
Design load (PDESIGNH) 4.2kW @ 2C
Declared Capacity @ 4.2kW @ 2C
Energy input 40W to 660W variable depending on load.

COOLING MODE
SEER 10.3
Energy Efficiency 10.3
Design output 2.5kW
Energy input 10.2W to 440W variable depending on load.
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Re: Air conditioning

Postby Bubbernator » 18 Aug 2022, 04:37

Ooooooh.
Mitsubishi. Highly regarded, well built.
I'm very jealous. Well done.
Enjoy the rest of your civilized summer.
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Re: Air conditioning

Postby Burgerman » 18 Aug 2022, 05:39

Its raining. This is britain!

:clap
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Re: Air conditioning

Postby LROBBINS » 18 Aug 2022, 07:48

At the moment I wish it were raining here in Siena. We are now at 34o and 80+% RH, feels like walking underwater and all I want to do is sleep. Except that I can't as there's to much on the to do list.
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Re: Air conditioning

Postby Burgerman » 18 Aug 2022, 08:23

The list, grows longer as you tick them off. My list has never been completed in 20 years.

I got air con done, and now we have a water leak. I have someone coming to fix that and now the plug sockets in the front of the house keep tripping with zero load... And theres about 15 other things I cant afford to do yet. Plus bills, cleaning jobs, gardening stuff, van MOT, house insurance, shopping food, noisy bed motor, just replaced backup chair battery, fire extinguisher refill/test, timeheets for carers to do and add up/wages, redo prescriptions etc etc.

Fortunately the heat will be over soon. Daylight hours are much shorted. 4 Hours shorter than june already. Then we have the opposite cold/dark problem.

P.S as soon as I turn on the air condittioning, even on really low, the humidity drops from 80 down to 45 in a matter of 10 mins...
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Re: Air conditioning

Postby shirley_hkg » 19 Aug 2022, 06:20

http://www.wheelchairdriver.com/gopro/s ... uality.mp4
How's the price going there since 2020 ?

My in-laws are moving to UK this fall.

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Re: Air conditioning

Postby Burgerman » 19 Aug 2022, 07:54

Well it all depends... Are we talking house costs? Or general inflation?

My house, which you show in your video, is a 4 bedroom detached bungalow. And its was valued at £320K 3 years ago. House prices rise by maybe 8 to 10% since then around here. So maybe £360K? Different areas in the same town(s) can be much cheaper. I live in one of the "better areas" of what is a poor ex fishing town. Whose industry was destroyed by the EU. Much of this town is run down, full of what we call "chavs" or the sort of people that you would not want to be anywhere near. Thats why property is cheap here.

The same property, in some parts of the country would be 2 to 3x the price depending where it is. And that same 360K would only get you a single room in parts of london. Which is now rediculously expensive and mainly non white native british... Thats a polite way of saying its a socialist run shithole where you are likely to find trouble and millions of black africans and everything else. Avoid!

Inflation, is around 10% and climbing fast. Recession in on the way. Property prices will fall. All basically driven by a crazy GREEN agenda. So fuel prices are now heading for 5k per year if you are careful! Politicians are just increadibly stupid, what can I say.

But yes property is also an issue in HK... So that may not worry them.

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Re: Air conditioning

Postby shirley_hkg » 19 Aug 2022, 15:10

Yes. Economy recess , interest rate is up, Pound Sterling is weak .



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Re: Air conditioning

Postby shirley_hkg » 13 Sep 2022, 13:33

A good move to overcome the energy crisis this winter. :thumbup:

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Re: Air conditioning

Postby Burgerman » 13 Sep 2022, 20:17

I agree.

I've had a few of these types of portable units. Noise is a major problem with most of them. It will drive you nuts if you have to use it a lot.
I have a Sharp 10,000 BTU unit it's been terrific. It's quiet mostly and chills the room pretty quickly and holds an accurate temperature. My experience has been buy a larger unit than you think you need. Manufacturers are notoriously false advertisers on these things.

F3HEAD


My laptop makes more noise than this unit.
As for false advertising these things are independently tested to british and EU standards by external labs on specific standardised tests so you can compare accurately inn different climates etc. They cant do any false advertising. Its all very much regulated at least here.

Honestly its so quiet that I cannot hear it unless I turn off the laptop. And even then its just a really soft air movement sound. Its so quiet I have to look to see if its actually on. It also murders this room. 500 watts is enough to heat it in winter. Under 1kw on the very coldest days. This thing can do more than this even at -20C (-5F) outside. So when heating or cooling 99% of the winter it needs much less than full power so will back to ultra low power/fan speeds after a few minutes. So the above is certainly not a problem.

With R32, and a proportional variable speed dual screw compressor, efficiency is very high on heating too. Not just when cooling. And it works down to -20C while still giving up to +170% of the input power out as heat. So even at -20C which doesent happen here ever as far as I know, its no problem. At an average 7C (our winter average) it is 480% efficient in heating. 1kwh electricity = 4.8kwh of heat output.

That means that I can save the planet by using electricity generated by burning millions of acres of forests across the world, coal, and natural gas shipped in at wildly inflated prices. All to make hugely overpriced electricity. While ignoring the cheap 100+ years worth of gas, and oil surounding us in our seas, or the 250 years worth of coal, gas, and oil we have under our feet. So we can say we are "green" banghead
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Re: Air conditioning

Postby shirley_hkg » 14 Sep 2022, 00:37

You have solar too.
I'm layman , and only watch out my wallet. drunk2

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Re: Air conditioning

Postby Burgerman » 14 Sep 2022, 12:51

I could not afford NOT to have free solar energy. Cheap chinesium DIY solar power!

At todays prices it would pay for itself in 1 year.
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Re: Air conditioning

Postby shirley_hkg » 03 Nov 2022, 16:14

How is your heat pump ?

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