Air conditioning unit - Loft room - recommendations and advice on purchase?

I have a loft room and bought a unit myself and had it installed. As many retailers follow the EU regulations requiring details of an f-gas ticket to purchase, you might have difficulty buying the unit yourself, and also finding someone to install it, if you haven't already (most installers I contacted wouldn't do it). You could look for a one man band on the f-gas register/refcom. As for power, there are calculators online to estimate what power you need based on the room size, size of windows etc, but you should choose a more powerful unit than the estimate as a loft room will require more cooling. All the models will be available in various capacities, measured in kW or btu. Almost all units will heat, apart from the very cheapest. Some people will recommend the premium brands e.g. Daikin, Mitsubishi electric. I don't have experience of these but I think any unit with a sufficient capacity will do the job, although the more expensive models should be more efficient and a bit quieter. The higher the SEER/SCOP number, the more efficient the cooling/heating. You can find the most efficient units at topten.eu/pri…n=3. As to the loft room being hotter than the rest of the house, mine is and my installer said his was too. Perhaps more insulation, space foil insulation, solar film/glass on the windows or painting the roof white or with special reflective paint/tiles would improve matters (possibly at the expense of needing more heating during winter), I'd be interested to hear if this is the case, but it would be expensive to find out. If it's hot outside, ventilation wouldn't help, so it would only be beneficial some of the time, mostly at night and often not even then during more frequent "tropical nights". I think solar panels might be worth considering - I have read several claims that they make the building cooler as well as power the air conditioning.