Your air conditioning system comes in handy in the effort to keep you comfortable for a large part of the year. When you AC comes to the end of its lifespan, it probably goes without saying that you are going to jump on the need to get it replaced as soon as you realize you might be without a cooling system during the next heatwave.
Before you opt to have a system that is similar to your previous one, you may want to consider choosing a unit that offers you a bit of a comfort and energy efficiency upgrade. Yes, modern AC units are going to be increasingly efficient, but at the same time, an inverter AC is going to offer you yet another step up in terms of energy use.