If your AC is not cooling like it used to, you’re not alone. Whether it’s blowing warm air or not running at all, this problem is one of the most common — and frustrating — HVAC issues homeowners face. In this post, we’ll walk you through the top reasons your AC isn’t cooling and when it’s time to call a professional.
HVAC technician fixing AC that is not cooling properly in a residential home
A clogged filter restricts airflow, reducing cooling performance and overloading your system.
Fix: Replace or clean your filter every 30–60 days.
Incorrect thermostat settings or dead batteries can fool you into thinking something’s wrong.
Fix: Double-check that it’s set to “cool” and the fan is “auto.”
Low refrigerant levels can prevent your AC from cooling effectively.
Fix: Only a licensed technician should refill refrigerant and check for leaks.
A sign of restricted airflow or refrigerant issues.
Fix: Turn off your system and let the coils thaw. Then call an HVAC pro.
If your AC makes a clicking noise or won’t start, the capacitor may be the issue.
Fix: Electrical problems are dangerous. Don’t DIY — call a technician.
Dust, grass, or leaves around your unit can block heat transfer.
Fix: Gently clean the condenser coils and remove surrounding debris.
If you’ve added rooms or expanded your home, your AC may not handle the load anymore.
Fix: Ask an HVAC expert to assess if you need a larger unit.
If your AC is not cooling after basic checks, or if you hear strange noises, smell burning, or see water leakage, call a licensed HVAC technician immediately.
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Schedule seasonal maintenance
Keep vents open and clean
Replace filters regularly
Avoid blocking the outdoor unit
Preventative care is the easiest way to avoid costly emergency repairs.
Want to understand how to make your system more efficient?
Visit this Energy.gov page on air conditioners to learn about energy-saving tips and best practices.
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