AC Not Cooling
PriorityAir conditioner running but not producing cold air or keeping up with temperature.
When your AC runs but does not cool, the problem could be simple or complex. Start with basic checks like filter and thermostat. If those are fine, the issue likely requires professional diagnosis. Refrigerant problems, compressor failures, and airflow issues all present similarly but have very different solutions. Running a system with low refrigerant can cause further damage, so prompt attention is important.
Symptoms to Look For
Possible Causes
What You Can Check
Before calling for service, try these safe checks that may resolve simple issues:
When to Call a Professional
If DIY checks do not resolve the issue, or if you see ice formation, hear unusual sounds, or the system will not start, professional diagnosis is needed. Refrigerant issues, electrical problems, and compressor concerns require trained technicians.
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Call (650) 540-7205 or book online.
Prevention Tips
Frequently Asked Questions
Why is my AC blowing warm air suddenly?
Sudden warm air usually indicates refrigerant loss, compressor failure, or power issues with the outdoor unit. Check if the outdoor unit is running. If it is not, there may be an electrical issue. If running but blowing warm, refrigerant or compressor problems are likely.
Can a dirty filter really stop my AC from cooling?
Yes. Severely restricted airflow from a clogged filter can freeze the evaporator coil, preventing cooling entirely. It also strains the system and reduces efficiency. Monthly filter checks during cooling season prevent this.
How do I know if my AC is low on refrigerant?
Signs include reduced cooling, ice on refrigerant lines, hissing sounds, and the system running constantly without reaching setpoint. A technician can measure refrigerant levels directly.
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