May Require Emergency Service

AC Not Cooling? Expert Diagnosis & Repair

When your air conditioner runs but doesn't cool, it can make your home uncomfortable and even dangerous during hot weather. This common problem has many potential causes, from simple fixes to major repairs.

Call (650) 397-7060 Schedule Diagnosis

Signs & Symptoms

!AC runs but blows warm or room-temperature air

!House temperature won't reach thermostat setting

!Some rooms cool while others don't

!AC cycles on and off frequently

!Reduced airflow from vents

!Ice forming on AC unit or lines

Possible Causes

-Dirty or clogged air filter restricting airflow
-Low refrigerant due to leak
-Frozen evaporator coil
-Dirty condenser coils (outdoor unit)
-Faulty compressor
-Bad capacitor or contactor
-Thermostat malfunction
-Ductwork leaks losing cool air
-Undersized AC unit for home

DIY Troubleshooting Steps

Try these steps before calling a professional (unless it's an emergency):

1Check and replace air filter if dirty
2Ensure thermostat is set to "cool" and temperature is below room temp
3Check that outdoor unit is running and not blocked by debris
4Make sure all vents are open and unobstructed
5Turn off AC for 2-3 hours if you see ice forming
6Check circuit breaker for tripped breakers

When to Call a Professional

!AC still doesn't cool after changing filter
!You see ice on the unit or refrigerant lines
!Outdoor unit isn't running
!You hear unusual sounds like grinding or squealing
!There's a refrigerant leak (oily residue near unit)
!Problem persists after basic troubleshooting

Estimated Repair Costs

Diagnostic: $89-$129

Minor Repair: $150-$400

Major Repair: $500-$2,500

Minor fixes include capacitor, contactor, or refrigerant recharge. Major fixes include compressor or coil replacement.

Prevention Tips

* Change air filters monthly during cooling season

* Schedule annual AC maintenance before summer

* Keep outdoor unit clear of debris and vegetation

* Don't close too many vents - it restricts airflow

* Use a programmable thermostat to reduce strain on system

Frequently Asked Questions

Why is my AC running but not cooling?

The most common causes are a dirty air filter, low refrigerant, frozen coils, or a faulty compressor. Start by checking your filter - a clogged filter can reduce cooling capacity by 15% or more.

How much does it cost to fix an AC that's not cooling?

Costs vary widely based on the cause. Simple fixes like a capacitor or refrigerant recharge cost $150-$400. Major repairs like compressor replacement can cost $1,500-$2,500.

Can I add refrigerant myself?

No. Refrigerant handling requires EPA certification. More importantly, if your system is low on refrigerant, there's likely a leak that needs professional repair first.

Need Help?

This issue may require emergency service. Call now for immediate assistance.

(650) 397-7060 Schedule Online

* 15+ Years Serving the Bay Area

* Same-day diagnosis available

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Experiencing AC Not Cooling?

Our expert technicians can diagnose and fix this issue quickly.

Call (650) 397-7060