Refrigerant Leak

Definition

A residential AC's refrigerant circuit is a sealed loop — a one-time factory charge that the equipment carries for its lifetime. There is no scheduled refrigerant top-off and no maintenance "refill." If the system is low on refrigerant, it has a leak.

Diagnosis follows EPA 608 protocols: visual inspection, soap-bubble test on accessible joints, nitrogen pressure test (system charged with nitrogen, pressure decay timed), electronic leak detector (sniffs for refrigerant traces), UV dye injection (dye circulates with refrigerant, leaks fluoresce under UV light). Common leak locations: evaporator coil (formicary corrosion), line-set rub-throughs (vibration against framing or attic structure), Schrader valves on service ports (worn seals), and field-brazed joints from the original install.

Once located, the leak is repaired (brazing, replacing valve cores, or coil replacement), the system is evacuated to deep vacuum (500 microns) to remove moisture, and recharged to the manufacturer's specification — usually by weight on the nameplate, not by gauge pressure.

Federal law (EPA 608) requires certified technician handling for any refrigerant work and prohibits intentional venting. Cheap Cold Air is EPA 608 certified across all refrigerant types.

Why it matters in Austin

Refrigerant leaks present three problems in Austin homes: warm air at the registers (low charge means poor heat absorption at the evaporator), iced-up evaporator coil (drops below freezing when undercharged), and rapidly rising electric bills (compressor runs nonstop trying to satisfy the thermostat).

The single biggest mistake we see from less-careful HVAC shops is recharging without finding the leak. That's not a repair — it's renting a few months of cooling, then doing it again. We will recharge to verify capacity, but we always pair it with leak detection. If the leak is severe (coil, line set), we'll tell you straight what the repair-vs-replace decision looks like.