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Dye testing is a widely used method for detecting refrigerant leaks in HVAC systems. This technique involves injecting a fluorescent dye into the refrigerant system, which circulates through the system with the refrigerant. When there is a leak, the dye escapes through the leak point and can be visually detected by shining a UV light on the area. The distinct fluorescence of the dye allows technicians to pinpoint the exact location of the leak quickly and efficiently, facilitating repairs.

While thermal imaging, ultrasonic leak detection, and pressure drop tests are also effective methods for identifying leaks, dye testing is particularly valued for its simplicity and visual confirmation of the leak's location, making it a common choice among HVAC professionals.