As the weather heats up, you may be wondering whether your air conditioner can make it another summer. If your unit is more than 20 years old, the answer is probably no. Even if it’s still running, an outdated air conditioner is likely to be less efficient and break down more often than a newer model. That doesn’t mean you have to replace your AC right away. If it’s still working well, you can wait a few years before upgrading to a new unit. But if your AC is starting to show its age, it’s worth considering a replacement. Here are a few things to keep in mind: First, an older air conditioner is likely to be less energy-efficient than a new one. That means higher utility bills and more impact on the environment.