If it seems like your car's air conditioner takes a long time to cool you off, or if the air isn't as cold as it used to be, you should take it to the shop at your earliest convenience. Otherwise, the problem may continue to escalate until your air conditioner gives out totally on a very hot day. Getting your air conditioner serviced is usually a quick procedure, especially if you go to a shop that's dedicated to working on auto AC units.
It was a flying rock, drastic temperature shock, or accident, and it has left your car with the slightest crack across the windshield. You may look at this seemingly miniscule damage and decide that, hey, that's really something that you can live with and skip repairs or replacement. Unfortunately, choosing not to replace or repair a car windshield that has minimal damage is never a good idea. In fact, ignoring the problem could just make things worse in the long run.