CORE COMFORT HVAC · ARIZONA
Central AC Not Cooling? Common Causes and Next Steps
What it usually means when your system runs but the house stays warm.
When your central AC runs but the house doesn’t cool, the cause could be refrigerant, airflow, a component failure, or a thermostat issue. This guide explains the common causes and what to check.
What to check
- Is the filter clean and unblocked?
- Is the outdoor unit clear of debris and airflow?
- Is the thermostat set and reading correctly?
- Are any breakers tripped?
- Are some rooms cool and others not?
Common causes
- Low refrigerant from a leak
- Dirty coils or filters restricting airflow
- A failing capacitor, contactor, or compressor
- Duct leaks or imbalance
- Thermostat or wiring faults
A LITTLE CLARITY BEFORE YOU DECIDE
Frequently Asked Questions
Why is my AC running but not cooling?
Common causes include low refrigerant, dirty coils or filters, or a failing component. We diagnose the exact cause.
Should I turn it off if it’s not cooling?
If it runs but doesn’t cool, continued running can stress components. A brief check of the filter and thermostat is fine; then call for service.
Could it be the thermostat?
Yes — a faulty thermostat can prevent cooling even when the equipment works. We check it as part of the diagnosis.
How fast can you come out?
We offer same-day and emergency service. Call (602) 960-2278.
How do I schedule?
Call (602) 960-2278, book online, or use our Contact page.
AC Running but Not Cooling?
Call for same-day diagnosis, or send the symptoms through our Contact page.
Prefer to talk? Call (602) 960-2278.