Summer in Sterling, VA can be brutally hot, and nothing is worse than discovering your air conditioner isn’t keeping up. If your AC is running but not cooling your home effectively, several culprits could be behind the issue. While some problems require professional repair, others can be handled with simple checks and regular maintenance.
Here’s what you should know: an air conditioner that’s not cooling isn’t always broken. Often, small issues with airflow, filters, or thermostat settings can cause major discomfort. When heat and humidity take over, it’s important to understand what might be limiting your AC’s performance before calling for help. By running through a quick checklist, you might avoid a service visit and restore cool air faster.
These expert-approved tips can help you pinpoint the problem and potentially solve it. Homeowners with air conditioners in Sterling, VA should pay attention to these seven summer troubleshooting steps to help their system perform at its best when it matters most.
1. Check and Replace Your Air Filter
One of the most common reasons an AC stops cooling is a clogged or dirty air filter. When the filter becomes blocked, it restricts airflow and makes the system work harder than it should. This leads to inefficient cooling and can even cause the evaporator coils to freeze over.
Inspect your air filter at least once a month during peak summer use. If it looks gray or dusty, swap it out with a clean one. High-efficiency filters are ideal, but even basic replacements will help your system breathe easier and cool more efficiently.
2. Inspect Your Thermostat Settings
Believe it or not, the issue might be as simple as incorrect thermostat settings. Double-check that the thermostat is set to “cool” and that the fan is set to “auto” instead of “on.” The “on” setting keeps the fan blowing even when the system isn’t cooling, which can circulate warm air.
Also, make sure the thermostat isn’t exposed to direct sunlight or heat sources, which can cause false readings and prevent your system from running when it should.
3. Clean the Outdoor Condenser Unit
Your air conditioner’s outdoor unit plays a crucial role in releasing heat. Over time, dirt, grass clippings, leaves, and other debris can collect on the unit, blocking airflow and reducing performance.
Use a garden hose (not a pressure washer) to gently rinse off the fins and remove buildup. Trim any plants or shrubs at least two feet away to keep the area clear. Never try to open the unit yourself—leave internal maintenance to HVAC professionals.
4. Check for Blocked or Closed Vents
Uneven cooling or weak airflow might be caused by closed or blocked vents throughout your home. Walk around and inspect each room’s supply and return vents. Make sure nothing is blocking them. This includes furniture, curtains, or rugs.
It’s also important not to close vents in unused rooms, as this can disrupt the balance of your HVAC system and put unnecessary strain on it, leading to poor performance.
5. Look for Ice Buildup on the Evaporator Coil
If you notice your AC is blowing warm air or no air at all, frozen evaporator coils could be the reason. Ice buildup occurs when there’s insufficient airflow, usually from a dirty filter or a blocked return vent.
Shut off the system and let it thaw completely before turning it back on. Be patient. This could take several hours. Once thawed, address the underlying airflow issue to prevent it from happening again.
6. Examine Refrigerant Levels and Leaks
Low refrigerant is a common cause of AC systems that run but don’t cool. Unlike fuel, refrigerant doesn’t get used up; if levels are low, it usually means there’s a leak.
Signs of a refrigerant problem include hissing sounds, icy coils, or uneven cooling. This isn’t something homeowners should try to fix on their own; only a licensed technician can recharge refrigerant and seal leaks safely.
7. Consider the System’s Age and Efficiency
Sometimes, a struggling AC isn’t suffering from a specific issue. It’s simply reaching the end of its useful life. Most systems last 10 to 15 years. As they age, they become less efficient and more prone to problems, especially during peak summer months.
If your AC is more than a decade old and repairs are becoming frequent, it may be time to consider a replacement. New systems offer better performance and energy savings, especially when properly sized for your home.
Don’t sweat it when your AC stops cooling properly. Start with these troubleshooting tips to get your home comfortable again. Regular maintenance, like changing filters and cleaning the outdoor unit, can go a long way in preventing issues. For more serious problems like refrigerant leaks or frozen coils, professional service is essential to keep your system running safely and efficiently.
If you’ve tried these steps and your AC still isn’t cooling, trust the local experts at YAZD Mechanical. Whether you need a repair, replacement, or maintenance plan, we’re here to help homeowners with air conditioners in Sterling, VA stay cool all summer. Contact us today to schedule your AC service.