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AC Not Cooling

Is your air conditioner running but not cooling your home? Learn the common causes and solutions.

This may need urgent attention

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Common Symptoms

If you're experiencing any of these symptoms, you may have this problem:

Air conditioner is running but warm air comes out
AC blows air but house stays hot
Thermostat shows higher temperature than setting
Cooling is uneven throughout the house

Possible Causes & Solutions

Dirty Air Filter

DIY Possible

Replace or clean the air filter monthly during heavy use

Low Refrigerant

Pro Required

Professional refrigerant leak detection and recharge needed

Frozen Evaporator Coil

Pro Required

Turn off AC, check filter, and call for service if persists

Dirty Condenser Coils

DIY Possible

Clean debris from outdoor unit, professional coil cleaning recommended

Faulty Compressor

Pro Required

Professional diagnosis and repair or replacement required

Thermostat Issues

DIY Possible

Check batteries, settings, or replace thermostat

When to Call a Professional

While some issues have DIY solutions, HVAC systems are complex. Call a professional when:

  • DIY solutions don't resolve the problem
  • The issue involves electrical components
  • You smell gas or burning odors
  • The problem returns after temporary fixes
  • Your system is under warranty (DIY repairs may void it)
Call San Jose HVAC Pros: (650) 397-7060

Related Services

AC Repair

Expert diagnosis and repair for all AC makes and models

$89-$500+

AC Maintenance

Preventive maintenance to keep your AC running efficiently

$89-$199

Frequently Asked Questions

Why is my AC blowing warm air?

Common causes include low refrigerant, a dirty air filter, frozen evaporator coils, or a faulty compressor. Our technicians can diagnose the exact issue.

How much does AC repair typically cost?

AC repairs typically range from $89-$500+ depending on the issue. We provide upfront pricing before any work begins so there are no surprises.

Should I repair or replace my AC unit?

Generally, if your unit is over 10-15 years old and repairs exceed 50% of replacement cost, replacement is often more economical in the long run.

How long does an AC repair take?

Most common repairs are completed in 1-2 hours. More complex issues or those requiring parts may take longer, but we always communicate timelines clearly.

Related Problems

AC Won't Start

Air conditioner won't turn on at all? Here are the common reasons and what to do.

AC Water Leak

Water pooling around your AC unit? This could cause water damage. Learn why it happens.

Noisy AC

Unusual sounds from your AC? Different noises indicate different problems. Find out what yours means.

Need Help With AC Not Cooling?

San Jose HVAC Pros technicians are ready to diagnose and fix your problem

Call Now: (650) 397-7060 Schedule Service
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