AC running but not cooling in Knoxville
The list of causes is short and two of them are free to check. Here is what each one typically costs to put right.
Diagnostic visit: $80-200, usually credited against the repair
Capacitor or contactor: $150-450
Refrigerant leak search and repair: $500-1,600
National researched ranges, one local company, free written quote
Running but not cooling is a short list
| What you notice | Usually | Rough cost |
|---|---|---|
| Outdoor fan not spinning | Capacitor | $150-450 |
| Ice on the line or coil | Airflow or refrigerant | $150-1,600 |
| Runs constantly, barely cools | Charge, coil or undersized | $300-1,600 |
| Nothing happens at all | Breaker, thermostat, contactor | $80-450 |
Knoxville averages about 72% relative humidity across the year. In that air a system has to remove moisture before the room can feel cool, which is why an oversized unit here makes things worse: it satisfies the thermostat quickly, shuts off, and never runs long enough to dry the air.
Two things to check before you call
Change the filter and look at the outdoor coil. A filter that has gone grey and a coil packed with grass clippings account for a large share of call-outs, and both are free to rule out. If there is ice anywhere, switch the cooling off and leave the fan running - running it iced does damage that costs real money.
Common questions
Is topping up the refrigerant a fix?
No. A sealed system does not consume refrigerant, so if it is low there is a leak. Topping up without finding it means paying for the same gas again next season.
Repair or replace?
Compare the repair against the age. A large repair on a unit past twelve years is usually money spent on the wrong thing; the same repair at year six is not.
Get written quotes in Knoxville
Tell us what it is doing - fan spinning or not, ice anywhere, how long since the filter was changed.
Or call (877) 701-2518
Prices in nearby cities
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