An AC that runs constantly without holding temperature is telling you one of three stories: airflow, refrigerant charge, or a system that can no longer keep up. In a Kentucky July — where humidity is half the battle — here's how to narrow it down.
Start with airflow: filter and coils
A clogged filter is the most common culprit and the only one you can fix yourself in five minutes. Weak airflow from the vents, ice on the refrigerant lines, or a system that runs and runs are all classic signs. Change the filter, let any ice thaw completely, and give it a few hours.
Is it low on refrigerant?
An air conditioner doesn't "use up" refrigerant — low charge means a leak. The signs overlap with airflow problems (long run times, ice, warm-ish air), which is why guessing is expensive. Diagnosing charge properly takes gauges and training; topping off a leaking system every summer is money down the drain compared to finding the leak.
Or is the system simply at its limit?
Kentucky's summer load is as much humidity as heat. A system that's undersized, aging, or fighting leaky ducts may run flat-out on the hottest weeks and still lose ground. If that's been getting worse each year, the question shifts from this repair to the repair-or-replace decision — which we'll walk through honestly.
What will a proper diagnosis include?
Equipment condition, airflow, electrical, controls, and charge — the whole system, not just the loudest symptom. That's every call, every time. Start with AC repair, or prevent the August breakdown with a spring tune-up.