When you visit your local physician’s office, they normally perform a few routine tests. It doesn’t matter whether your visit is for a yearly exam or sudden illness; they take these tests each time. Without exception, they measure your blood pressure, weight, and temperature.
These tests, along with a few more, help the physician discover invisible health issues that could cause you problems later. Their goal is to be proactive, not reactive. The doctor wants to find and address any issues you have before they turn into something worse. The key is prevention. Could you follow the same line of thinking for an HVAC system?