Hi, I used Chillout for my aircon, they are very good, fitted my 3 units finished by lunchtime, and away, very proffesional, the units they have quoted are a very good make, but probably not the latest inverter types, that is why they are more expensive to run, Speak to the guys at chillout and they will give you good advice, and not rip you off. Also when we had ours installed we got a free water filtration system, which means no more bottled water. Hope this helps Andy.