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.
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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.
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