Of course, if your AC currently isn’t working right, then now is the time to get it checked. Many service centers can inspect and test your air conditioning and offer evacuation and recharge services. This goes a long way to avoiding having to bring your air conditioner in for major repairs.
Recent environmental laws have stopped the manufacture of Freon, a refrigerant that was common in cars made before 1993. There is a very limited supply of Freon so the price is very steep. It may not be worth its weight in gold, but it probably is worth its weight in silver. If you have an older Arizona vehicle that uses Freon, you may want to consider having it retrofitted to use the new EPA-approved R134a refrigerant. It will pay for itself in the long run.