An AC that runs but doesn’t cool properly is usually caused by blocked airflow, incorrect thermostat settings, dirty coils, low refrigerant, or air leaks in the ductwork. The most common issue we find is a clogged air filter that starves the system of airflow and reduces heat removal. Other times the outdoor coil is matted with debris or the refrigerant charge is low, which prevents the system from absorbing and releasing heat as designed. Our techs see this often and can quickly pinpoint the restriction or loss of capacity; we handle these problems for many homeowners around North Aurora.
- Start by setting the thermostat to Cool/Auto and lowering it below room temperature.
- Replace a dirty filter and clear leaves from the outdoor unit; gently rinse the coil with a garden hose.
- If you see ice on the refrigerant lines or water in the drain pan, turn the AC off and call for service.
- Warm air from vents, frequent short cycling, or repeated breaker trips signal professional repair. Shut the system off for 30 minutes if you notice icing to protect the compressor.
Updated: 2026-07-05
Need help in North Aurora, IL? Call (331) 294-8731 or book online. “Within an hour, I had RJ at my house getting us back and running.” — Sarah B.