Troubleshooting An Air Conditioner That Isn't Cooling: A Comprehensive Guide
Why Isn’t My AC Cooling? A Homeowner’s Guide to Troubleshooting
When your air conditioner stops cooling properly, your home can quickly become hot and uncomfortable. But before you call in a professional, there are several simple troubleshooting steps you can take that might fix the issue and save you time and money.
Here’s a straightforward guide to help you diagnose common AC problems and get your system running efficiently again.
1. Check and Reset the Thermostat
Start by confirming that your thermostat is set to “Cool” and the fan is on “Auto.” It’s easy to accidentally leave it on “Fan” mode, which circulates air without cooling.
If your thermostat uses batteries, replace them to eliminate power issues.
2. Replace Dirty Air Filters
Clogged air filters are one of the most common reasons an AC stops cooling. Dirty filters block airflow, forcing your system to work harder and cool less effectively.
Check your filters monthly and replace them every 1–3 months, depending on usage and manufacturer recommendations.
3. Clean the Outdoor Condenser Coils
Your outdoor unit’s condenser coils can get dirty over time, reducing efficiency and causing the system to overheat.
Turn off the power, then gently spray the coils with a garden hose to remove dirt and debris. Avoid high-pressure water, which can bend the fins.
4. Clear the Condensate Drain Line
Your AC pulls moisture from the air and drains it away—but if the drain line gets clogged, it can back up and impact performance.
Use a wet/dry vacuum or a long flexible brush to clear any blockages in the drain line and avoid water damage.
5. Look for Refrigerant Leaks
Low refrigerant levels can significantly reduce cooling power. Signs of a possible leak include ice on the refrigerant lines or evaporator coil and poor cooling performance.
Refrigerant issues require a licensed HVAC technician. If you suspect a leak, contact JBG Heating & Air Conditioning LLC for a professional inspection.
6. Check the Power Supply
A tripped breaker or blown fuse can shut your system down entirely. Check your home’s breaker box and reset if needed.
Also, ensure the disconnect switch near the outdoor unit is turned on. If electrical issues persist, call a qualified technician.
7. Inspect Ductwork for Leaks
Even if your AC is working, cool air can escape through damaged or leaky ducts before reaching your living spaces.
Look for visible damage or loose connections and seal them with duct tape or mastic sealant. Well-insulated, sealed ducts are key to efficient cooling.
8. Listen for Compressor Issues
The compressor is your AC’s main component—it circulates refrigerant to remove heat from your home.
If you hear loud or unusual noises coming from the outdoor unit, the compressor may be failing and will need professional attention.
9. Unblock Vents and Registers
Walk through your home and make sure that all vents and registers are open and unobstructed. Furniture, rugs, or curtains blocking vents can restrict airflow and reduce cooling effectiveness.
Final Thoughts
Troubleshooting your air conditioner before calling in the pros can often solve simple issues and keep your system running smoothly. However, some problems—like refrigerant leaks, compressor failure, or electrical faults—are best handled by a licensed HVAC technician.
If you’ve tried the tips above and your AC still isn’t cooling, don’t sweat it—call JBG Heating & Air Conditioning LLC. With over 12 years of experience and a commitment to reliable, honest service, we’ll help get your home back to a cool and comfortable state in no time.
