In Sherman Oaks, where summer temperatures often soar into the 90s, a fully functioning air conditioner is essential—not optional. Yet, even the best systems can develop problems that disrupt your comfort and spike your energy bills. Left unresolved, these issues can turn into costly repairs or complete system failure.
This guide covers the 10 most critical AC problems in Sherman Oaks and provides expert-approved solutions to help you stay cool, safe, and stress-free all season long.
1. AC Blowing Warm Air
Common Causes: Thermostat Settings, Low Refrigerant
Few things are as frustrating as turning on your AC only to feel warm air. This could be due to:
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Incorrect thermostat settings
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Low refrigerant levels due to leaks
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Faulty compressor or electrical disconnect
Expert Solutions: System Recharging & Calibration
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Set thermostat to “cool” and lower than room temp
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Have an HVAC technician test refrigerant pressure
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Repair leaks and recharge with proper refrigerant
2. Weak or No Airflow
Duct Blockages or Blower Motor Malfunctions
Reduced airflow can indicate:
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Clogged air filters
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Blocked ductwork
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Blower motor failure
How Professionals Diagnose and Restore Airflow
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Replace or clean filters
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Inspect ductwork for obstructions or damage
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Test and replace faulty fan motors or capacitors
3. Strange Noises from the AC Unit
Banging, Screeching, Clicking Sounds Explained
Unusual sounds could mean:
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Loose parts
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Worn belts or bearings
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Electrical arcing or relay issues
When to Call a Technician for Immediate Service
If the noise is persistent or sudden, shut off the unit and call a local HVAC professional immediately to prevent further damage.
4. Frequent Cycling On and Off
Causes: Dirty Coils, Oversized Units, Electrical Faults
Short cycling stresses your system and raises your energy bills. Common causes include:
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Dirty condenser or evaporator coils
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Oversized unit for your home
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Faulty relay or control board
Solutions: Tune-Ups and Smart Thermostat Integration
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Clean and inspect coils
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Evaluate unit size with a Manual J calculation
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Upgrade to a smart thermostat for better control
5. Frozen Evaporator Coils
Signs, Risks, and Underlying Issues
Frozen coils can cause:
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Poor airflow
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Ice buildup on lines
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AC system shutdowns
Proper Thawing, Cleaning, and Preventative Care
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Turn off the system and let it thaw
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Check for dirty filters or low refrigerant
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Schedule regular maintenance to prevent recurrence
6. Water Leaks Around the AC System
Clogged Drain Lines or Broken Condensate Pumps
If you notice pooling water:
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The condensate line may be blocked
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The drain pan could be cracked
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Pump failure may be causing backups
How HVAC Experts Prevent Water Damage
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Clear and sanitize drain lines
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Repair or replace pumps and pans
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Ensure unit is level and draining properly
7. High Humidity Levels Indoors
AC Not Dehumidifying Properly
An AC that cools but doesn’t remove moisture can make your home feel muggy.
Upgrading to Systems with Moisture Control Features
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Install a variable-speed system or whole-home dehumidifier
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Check if your current unit is sized and functioning properly
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Use smart thermostats with humidity sensors
8. Tripped Breakers or Electrical Failures
Power Surges, Bad Capacitors, or Wiring Issues
If your AC trips the breaker often, it may be:
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Overheating
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Drawing too much power
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Experiencing internal shorts
Safe Diagnosis and Electrical Repair
Never attempt electrical repairs yourself. Certified HVAC techs will:
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Test capacitors and fuses
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Repair faulty wiring
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Ensure system grounding
9. Bad Odors from the Vents
Musty, Burning, or Chemical Smells
Strange smells could be signs of:
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Mold growth in ducts or coils
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Electrical overheating
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Refrigerant leaks
Mold Removal and Air Purification Solutions
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Clean coils and ducts
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Install UV lights or air purifiers
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Use high-MERV filters to trap pollutants
10. Unresponsive Thermostat or AC Won’t Start
Dead Batteries, Wiring Problems, or Thermostat Failure
If your thermostat screen is blank or the system won’t kick on:
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Check and replace batteries
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Reset the breaker
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Inspect wiring connections
When to Replace vs. Repair the Thermostat
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If it’s more than 10 years old, consider upgrading to a smart model
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Replace faulty thermostats that fail to communicate with the system
Proactive Tips to Avoid Future AC Problems
Regular Maintenance and Early Warning Signs
Preventative care reduces breakdowns by over 70%. Look for:
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Unusual noises or smells
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Rising energy bills
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Inconsistent temperatures
Investing in Maintenance Plans from Local Experts
Most Sherman Oaks HVAC providers offer plans that include:
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Priority service
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Discounts on repairs
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Bi-annual tune-ups
FAQs
1. How often should I schedule AC maintenance?
At least once a year—preferably in spring before summer use peaks.
2. Why is my AC freezing up even though it’s hot outside?
It could be due to low refrigerant, dirty filters, or poor airflow.
3. What’s causing my AC to make a banging noise?
Likely a loose part, compressor issue, or damaged blower wheel.
4. Can I fix a clogged condensate drain myself?
Yes, with a wet/dry vac or vinegar flush. For serious clogs, call a pro.
5. How do I know if my thermostat is broken?
If it won’t turn on, doesn’t respond to settings, or reads the wrong temp.
6. Is high humidity a sign of AC failure?
Yes. It may indicate your AC isn’t dehumidifying properly or is undersized.
Conclusion
No one wants to deal with an AC emergency—especially during a Sherman Oaks heatwave. By understanding these 10 critical AC problems and knowing how to fix or prevent them, you’ll stay ahead of the curve and enjoy worry-free cooling all summer long. If your system shows any signs of trouble, call a trusted local HVAC expert to get your comfort back on track quickly and safely.
