My AC Guy Says My Evaporator Coil Is Leaking. Do I Need a New AC?
Maybe. But not necessarily.
An evaporator coil can absolutely leak refrigerant.
And if your AC guy actually found and confirmed a leak in the coil, that’s a legitimate diagnosis.
But a leaking evaporator coil does not automatically mean you need a whole new air conditioner.
The coil is replaceable.
First Question: Did They Actually Find the Leak?
Ask:
“Can you show me where the coil is leaking?”
Depending on the leak, a technician may confirm it with an electronic leak detector, bubble solution, nitrogen pressure testing or other diagnostic methods.
What we don’t love is:
“You’re low on refrigerant, so your evaporator coil must be leaking.”
Maybe it is.
But refrigerant can leak from plenty of other places.
Find it first.
If the Coil Really Is Leaking, Then What?
Now we look at the whole system.
How old is it?
What refrigerant does it use?
Is the coil under warranty?
What’s the condition of the outdoor equipment?
Has the system had other expensive repairs?
What will replacing the coil cost compared with replacing the system?
On a relatively new AC in otherwise good condition?
Replacing the coil can make perfect sense.
We’ve done exactly that.
On an old system with multiple problems where we’re about to spend thousands replacing a coil and refrigerant?
Replacement may make considerably more sense.
What Should You Ask?
Two questions:
“How did you confirm the evaporator coil is leaking?”
Then:
“What does repairing it cost compared with replacing the system?”
Those answers should be two separate conversations.
The Klein Answer
A leaking evaporator coil is a real problem.
It is not automatically a death sentence for your entire AC system.
Prove the leak.
Price the repair.
Look at the age and condition of everything else.
Then decide.
Because sometimes a leaking coil means:
Replace the coil.
And sometimes it means:
We’re probably done putting money into this air conditioner.
The equipment in front of us gets to decide which one.