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AC Repair Guide

Signs of AC Refrigerant Leak: What to Look For

Updated January 2026 • 5 min read

Important: If an HVAC company just wants to "recharge" or "top off" your refrigerant without finding the leak, that's a red flag. Refrigerant doesn't evaporate—if it's low, there's a leak that needs to be found and fixed.

How Refrigerant Works

Refrigerant is the substance that actually cools your air. It cycles between liquid and gas form, absorbing heat from inside your home and releasing it outside. Your AC system is sealed—refrigerant should never need "topping off" unless there's a leak.

Signs You May Have a Refrigerant Leak

Common Symptoms:

  • AC running but not cooling - The most common sign
  • Ice on the refrigerant lines - Frost on copper lines going to indoor unit
  • Frozen evaporator coil - Ice buildup inside air handler
  • Hissing or bubbling sounds - Indicates active leak
  • Higher electric bills - System works harder with low refrigerant
  • AC cycles on and off frequently - Compressor protection kicks in

Why "Recharging" Isn't a Real Fix

Some companies will add refrigerant without finding the leak. This provides temporary relief but:

  • The problem returns within weeks or months
  • You pay for refrigerant over and over
  • Refrigerant is expensive ($50-150+ per pound depending on type)
  • Releasing refrigerant is illegal and harmful to the environment

Proper Leak Repair Process

Here's what proper refrigerant leak repair looks like:

  1. Confirm low refrigerant: We test pressures and document readings
  2. Find the leak: Using electronic detectors, UV dye, or pressure testing
  3. Evaluate repair vs. replace: Some leaks are repairable; some mean the coil needs replacement
  4. Fix the leak: Repair or replace the leaking component
  5. Recharge properly: Add the correct amount of refrigerant by weight
  6. Verify the fix: Test system and confirm proper operation

When Replacement Makes Sense

Sometimes leak repair costs more than it's worth:

  • Multiple leaks: System may have corroded coils
  • R-22 systems: This old refrigerant is phased out and extremely expensive
  • Old equipment: If the system is 15+ years old, repair money may be better spent on replacement

We always explain your options and help you make the best decision for your situation.

AC Not Cooling?

We diagnose the problem properly, find the leak, and give you honest options.

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