Refrigerant Leak — Symptoms and Actions

A refrigerant leak is the silent cause behind many commercial air-conditioning failures: performance degrades slowly, the compressor compensates by working harder, then the system gives out exactly when it is needed most. It is also a regulatory and environmental issue — halocarbons are potent greenhouse gases whose handling is regulated.

What are the warning signs of a refrigerant leak?

The most reliable sign is a gradual loss of capacity: the unit still cools, but less and less, with ever-longer cycles. Add to that frost on lines or coil (a low charge drops the evaporating temperature), oil traces at fittings — escaping refrigerant carries compressor oil with it —, hissing near the circuit, or a detector alarm in the mechanical room.

What should you do while waiting for the intervention?

If a detector is in alarm or an unusual smell is noticeable in a closed room: ventilate, restrict access and report the situation — refrigerants displace oxygen in confined spaces. Otherwise, reduce the load on the unit (raised setpoint, non-critical zones shed) to spare the compressor. Do not attempt a recharge or tighten fittings: handling halocarbons requires specific qualifications.

Why can’t the repair wait?

A compressor running undercharged wears out prematurely — and replacing it costs far more than a leak search. Québec and Canadian halocarbon regulations also govern refrigerant recovery and recharging. Montréal Combustion locates leaks, repairs the circuit and recommissions commercial air conditioners, rooftop units and chillers across Greater Montréal: 450-473-0909.

Frequently Asked Questions

Can we just recharge the circuit and keep running?

No. Recharging without locating and repairing the leak wastes the new refrigerant, wears out the compressor and runs against halocarbon regulations: the leak must be found, repaired and the circuit tested before recharging.

Is a refrigerant leak dangerous for occupants?

Common refrigerants have low toxicity but are heavier than air: in a closed room or basement, a large leak can displace oxygen. Ventilate the space, restrict access and leave the assessment to qualified personnel — especially since some newer fluids are mildly flammable.

Who is allowed to handle refrigerants in Québec?

Recovery, recharging and disposal of halocarbons are governed by environmental regulations: they are restricted to qualified personnel holding the appropriate certification. Requiring that qualification from your contractor protects your own compliance.