What to do about an HVAC leak
An HVAC leak points to one of four places: refrigerant lines, drain lines, ductwork seams, or the air handler itself. Each one leaves a different sign, from ice on copper tubing to water pooling under the cabinet to uneven airflow in rooms that used to feel fine. Finding the sign tells you something is wrong; finding the cause takes a contractor with the right tools.
Where does an HVAC system leak and why
An HVAC system can leak in four distinct places, and each one leaves a different clue.
Refrigerant lines run between the outdoor unit and the air handler; when a joint corrodes or a fitting loosens, refrigerant escapes and the line frosts over. Ice forming on copper tubing outside or near the indoor cabinet is the sign to look for. Drain lines carry condensate away from the air handler, and a clogged or cracked line lets water pool beneath the unit or stain the ceiling below it. Ductwork develops gaps at seams and connections, which shows up as uneven airflow or a musty smell in rooms that used to feel normal. The air handler itself can collect standing water around its base when the drain pan cracks or the float switch fails. Walk each of these spots and use your nose as much as your eyes.
What your findings actually tell you about an HVAC leak
Ice on a refrigerant line is a symptom.
Knowing the refrigerant is low still leaves the question of where it went and by how much, and that requires gauges a contractor reads against the system's specifications. A wet drain pan looks like a straightforward clog until you pull the access panel and find a crack in the pan itself or a secondary drain that has been silently failing. Those two things look the same from outside the cabinet. Ductwork is similar. You can hold your hand near a joint and feel air moving where it should not, but the share of conditioned air escaping across the whole system only comes from a pressure test. What you find in your own walkthrough tells you something is wrong. It does not tell you the cause, and it does not tell you the fix.
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