When the temperatures in Sherman Oaks start to soar, there’s nothing more frustrating than realizing your AC is running, but your home still feels like an oven. This is a surprisingly common issue that many homeowners face, especially in areas like Sherman Oaks, where the weather can push cooling systems to their limit.
Understanding the root causes can save you time, stress, and even money. In this article, we’ll break down the top 7 reasons why your AC is running but not cooling in Sherman Oaks and provide practical guidance to fix each problem efficiently.
Why This Is a Common AC Problem in Sherman Oaks
Sherman Oaks experiences hot, dry summers and moderate winters. AC units here often run for extended periods, leading to faster wear and tear. Add in dust from the nearby hills and urban pollution, and it’s easy to see why cooling systems can underperform.
1. Thermostat Issues
Incorrect Settings or Calibration
Sometimes, the problem isn’t with the AC unit itself—it’s with the thermostat. If it’s not set to “cool” or the temperature setting is too high, the system won’t cool the space effectively.
How to Reprogram or Reset Your Thermostat
Check your settings and try lowering the temperature. If the system still doesn’t kick into proper cooling mode, reset the thermostat or replace the batteries. If your thermostat is outdated, consider upgrading to a smart thermostat that adapts to your usage patterns and provides alerts for issues.
2. Dirty Air Filters
How Dust and Debris Restrict Airflow
A clogged air filter is one of the most common culprits. When it’s filled with dust, pet hair, or debris, air can’t circulate properly. The AC struggles to push cooled air into your home, which makes it feel like it’s not working.
Signs You Need to Change Your Filter
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Reduced airflow from vents
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More dust in your home
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A musty smell when the AC runs
Change your filters every 30-90 days, especially during high-usage seasons.
3. Refrigerant Leak or Low Refrigerant
Why Low Refrigerant Causes Poor Cooling
Refrigerant is what cools the air your AC circulates. If levels are low due to a leak or improper charge, your system won’t be able to cool effectively.
Detecting and Fixing Refrigerant Leaks (Professional Help)
Look for signs like:
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Hissing or bubbling noises
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Ice on the refrigerant lines
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Longer cooling cycles
Call an HVAC professional in Sherman Oaks to test and recharge the refrigerant. This is not a DIY fix due to environmental and safety regulations.
4. Blocked or Dirty Condenser Coils
Outdoor Unit Maintenance in Sherman Oaks’ Dusty Climate
The condenser coil, located in your outside unit, is exposed to the elements. In Sherman Oaks, it’s easy for these coils to become coated in grime, leaves, or dust.
Cleaning Tips and Signs of Trouble
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Visual buildup of dirt on the unit
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AC runs constantly without cooling
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The fan turns on, but the air inside remains warm
Clean the coils using a garden hose (light spray only) or contact a professional for a deep clean.
5. Faulty Compressor
The Role of a Compressor in Cooling
The compressor is the heart of your AC unit. If it fails, your system can’t move refrigerant and cool your home.
How to Know If Yours Needs Replacement
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AC makes unusual noises (grinding, rattling)
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Tripped circuit breaker
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Warm air blowing despite the system running
A faulty compressor often requires replacement—a job for licensed HVAC professionals.
6. Electrical or Capacitor Problems
Faulty Capacitors, Relays, and Fuses
Electrical issues can prevent components like the compressor or fan motor from running properly. Capacitors start these motors, and if one fails, cooling stops.
Why Your System Needs a Professional Diagnostic
An experienced Sherman Oaks HVAC technician can run diagnostics to test electrical parts safely. Don’t attempt to handle capacitors—they can retain a dangerous charge.
7. Air Duct Leaks or Blockages
How Leaks Reduce Cooling Efficiency
Leaks or holes in your ductwork allow cool air to escape before it reaches your rooms, making your system work harder with poor results.
Locating and Repairing Duct Issues
Common signs:
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Uneven cooling across rooms
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Higher energy bills
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Whistling noises from the ducts
A professional can seal and insulate ducts to restore proper cooling.
How to Troubleshoot Your AC
DIY Checks Before Calling a Technician
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Ensure vents are open and unobstructed
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Check the thermostat settings
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Replace the air filter
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Inspect the outdoor unit for debris
When to Call a Sherman Oaks AC Specialist
If these steps don’t work, or you hear odd sounds or smell something burning, it’s time to call a local HVAC expert.
Cost of Repairs in Sherman Oaks
Average Price Ranges by Issue
| Issue | Estimated Cost (USD) |
|---|---|
| Thermostat replacement | $100 – $300 |
| Air filter change (DIY) | $10 – $40 |
| Refrigerant refill & leak repair | $200 – $1,200 |
| Coil cleaning | $100 – $400 |
| Compressor replacement | $1,000 – $2,500 |
| Electrical repairs | $150 – $500 |
| Ductwork repair | $300 – $1,000 |
How to Save on Emergency AC Services
Consider enrolling in a maintenance plan with a local HVAC provider. Many offer discounts and priority service during peak seasons.
Seasonal AC Maintenance Tips
Best Practices for Year-Round Efficiency
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Schedule tune-ups in spring and fall
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Keep outdoor units clear of debris
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Change filters regularly
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Use a programmable thermostat
Sherman Oaks Seasonal HVAC Maintenance Checklist
| Season | Recommended Tasks |
|---|---|
| Spring | Full AC inspection & refrigerant check |
| Summer | Filter change every month |
| Fall | Clean outdoor unit & ducts |
| Winter | Thermostat battery check |
When It’s Time to Replace Your AC
Repair vs. Replacement Cost-Benefit Analysis
If your AC is more than 10-15 years old and repairs exceed half the cost of a new system, replacement is often the smarter investment.
Energy-Efficient Options for Sherman Oaks Homes
Look for ENERGY STAR-rated models. Consider a ductless mini-split if you want targeted cooling with reduced energy usage.
FAQs
1. Why is my AC running but not cooling the house?
Dirty filters, low refrigerant, or a faulty thermostat are common causes. Inspect these first before calling a professional.
2. How long should an AC unit last in Sherman Oaks?
Typically, 10-15 years with proper maintenance. Dry, dusty conditions may reduce this slightly.
3. Can dirty coils cause the AC to not cool properly?
Yes, they can reduce heat exchange efficiency, making your AC work harder with little cooling.
4. How do I check for a refrigerant leak?
Look for ice on the refrigerant line or hissing noises. Always call a certified technician for confirmation.
5. What’s the best thermostat setting for energy savings?
78°F when you’re home and 85°F when you’re away, according to energy.gov.
6. Is it worth repairing an old AC unit?
If it’s over 12 years old and needs expensive repairs, replacement is more cost-effective long-term.
Conclusion
No one wants to sweat it out in their home during a Sherman Oaks summer. By identifying these 7 reasons why your AC is running but not cooling, you’re well on your way to solving the problem and staying comfortable. Whether it’s a simple fix like replacing a filter or something more complex like a compressor issue, understanding the root cause can save you frustration and cash.
