What can be used for leak detection that is safe with all refrigerants?

Using a soap or bubble solution is a commonly accepted method for leak detection in HVAC systems because it interacts safely with all types of refrigerants. When applied to the areas suspected of having a leak, the soap solution forms bubbles that will visibly expand and burst at the site of the leak, providing a clear visual indication of the issue. This method is inexpensive, straightforward, and does not pose any risk of chemical reaction with refrigerants, making it a universally safe choice.

In contrast, while electronic leak detectors can be very effective, they may not work equally well with all refrigerants, particularly those that do not have a strong electronic detection signature. Fluorescent dye is also a useful tool but involves introducing a substance into the system, which may not be compatible with every refrigerant or may require further clean-up. Vacuum gauges, meanwhile, are primarily used to assess the integrity of the system regarding moisture and pressure rather than directly indicating refrigerant leaks. Thus, the soap or bubble solution stands out as the safest and most universally applicable method for leak detection across all refrigerants.