Air conditioner part II

When we first started using it a few weeks ago it was around 18º. Then it was 22º, and now it's like 25-28º. And even at 28 I was feeling a little bit cold (but not cold enough to turn it off completely). I know it's not us or the air temperature, but when the guy came to 'fix' it, it went the other way and is now too strong! I suddenly started feeling very hot and didn't realise Mike had turned it up to 30º! D'oh!