Leaks in an HVAC system can quickly cause their efficiency to plummet. Sadly leaks in freon lines, especially tiny ones, can be extremely difficult to find and even dangerous to try to detect manually. Leak detectors make finding these leaks a much easier process even for the tiniest leaks. These tools are also great for older systems because they help conserve refrigerant, Once the leak is detected, you can begin the repair process and get the unit running smoothly.