on the topic of regassing aircon
Make Sure your mate or whoever does it evacuates the air con system for at least 30-45 minutes so that it gets rid of all the moisture (and gas) out of the system - THEN regas it.. thats the proper way it should be done.
there are too many dodgy people out there who will just add a bit more gas. this is not the proper way to do it. (this is the difference between a cheapo $75 regas, and a $120 proper serviced one)
Its also best to get regassed on a stinking hot day - because when they are measuring the amount of gas to put in, a hot day at least allows expansion and they can ensure they have the right amount of gas in the system. If they regas it on a cold day for example and if they then put too much gas in and havent allowed room for expansion, then youre in for trouble when a hot day comes around - but again, if theyre professional and know their sht and arent just some apprentice then you'll be fine and it wont matter when you take the car.
I know its going in a bit deep, but if you want a perfect job follow the above.