HVAC · Troubleshooting

AC Not Cooling

If you're dealing with ac not cooling, this guide walks through what the symptom usually means, the causes worth ruling out, the checks you can safely do yourself, and the point where it's time to bring in a technician. Roxly handles ac repair throughout the Charlotte metro area.

What this symptom usually means

an AC that runs but doesn't cool means the system is moving air but isn't removing heat from it — the cause is usually airflow, refrigerant, or an electrical component, not the whole system. It's rarely a single guaranteed cause, which is why a proper diagnosis matters.

Likely causes

• Dirty air filter or coil. A clogged filter or dust-caked evaporator coil restricts the airflow the system needs to absorb heat.
• Low refrigerant from a slow leak. The refrigerant charge is what actually removes heat from the air; low charge means weak or no cooling.
• A failed capacitor or contactor. These small electrical parts start and run the compressor and fan motors — a common, inexpensive failure point.
• A dirty or blocked outdoor condenser. Debris around the outdoor unit prevents it from rejecting the heat it just pulled from the house.
• A frozen evaporator coil. Restricted airflow or low refrigerant can ice the coil, which then blocks airflow further and stops cooling entirely.
• A failing compressor. The compressor is the heart of the system; a weak or failed compressor means little to no cooling capacity.

Safe checks you can do first

These are safe for anyone — no tools, gas, refrigerant, or electrical work:

• Check and replace the air filter if it's dirty.
• Confirm the thermostat is set to Cool, several degrees below room temperature.
• Clear leaves, mulch, or debris from around the outdoor unit.
• Check the outdoor breaker hasn't tripped.

What not to attempt

• Don't open the refrigerant system or add refrigerant yourself.
• Don't run the system if the indoor coil is visibly frozen — turn it off and let it thaw.
• Don't repeatedly reset a tripped breaker — that usually signals a real electrical fault.

Repair, not replace

Roxly performs HVAC repair and maintenance on already-installed systems. Most of the causes above are serviceable components — a capacitor, contactor, motor, or coil repair — not a reason to replace the whole system. We don't install new systems or replace a condensing unit, air handler, or furnace.

When to call a technician

If the filter is clean, the outdoor unit is clear of debris, and the system still won't cool, the remaining causes need a technician's gauges and electrical testing to isolate. A technician diagnoses the actual fault and reviews findings and an estimate before any work. Service availability may vary by location, equipment type, brand, technician availability, licensing requirements, and the scope of the requested work. Contact Roxly Appliance & Refrigeration Repair to confirm service availability for your address and equipment.

Frequently asked questions