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I would stay away from portable units or even ones with combined condenser / fans like the one you linked to.
The main issue with these is that the heat being transferred is generated in the house. This means you’ve got to cool down the room but the unit itself is causing some of the warming.
We’ve just had 4 units installed and a large 8kw condenser. It was £££ (about £9k) but it’s extremely energy efficient and is able to cool down the rooms quickly and maintain good temp over a long period of time with low effort.
A single split unit with a 2kw cassette is probably around £1,200 to install.
Our 8kw condenser Is virtually silent at full whack, running 4 cassettes.
Talk to me about air conditioning units (predictably), I live in a 1910 victorian semi-detached and want a way of cooling my bedroom. I think my options are a mobile unit with a pipe out the window or a more traditional fixed unit with internally/externally mounted units. Are there any other options?