Air condition doesn't blow enough!

Any ideas what's the problem:

During the autumn I had a problem with the windscreen getting steamy, and now during the summer the car won't get cold and doesn't seem to blow enough air either.

Now I did the air conditioning maintenance today, and they recharged the system. Same problem still. Not really COLD air and the blow is really not good. If you put it to max it keeps a lot of noise but very little air coming through.

What to do?