It's 85 degrees outside. Your air conditioning system is running—you can hear the compressor, feel the fan, everything sounds normal. But your house is still 78 degrees inside. Your AC is doing its job, right? Not quite.
Experiencing this problem right now? Call 919-271-7961 or contact us to schedule a service call.
If your AC is running but your home isn't cooling down, something's wrong. And the problem could be something simple you can fix, or something more serious that needs attention. Here's how to figure out which one you're dealing with.
Before you panic or call a technician, check a few things that often get overlooked.
This is first because it's the most common culprit. Walk over to your thermostat and look at the settings. Is it actually set to cool mode? Is the temperature setting lower than your current home temperature? If your thermostat is set to 80 degrees and your home is 78, your AC won't kick in—it's already at the target temperature.
Also check if your thermostat is in the right location. Thermostats placed in direct sunlight, near heat sources like lamps, or in doorways with drafts can give false readings. If your thermostat thinks your home is cooler than it actually is, it won't cool.
If you have a programmable thermostat, double-check that your schedule is set correctly. Sometimes old schedules stick around and override manual adjustments.
A clogged air filter is one of the biggest reasons an AC system runs but doesn't cool effectively. When your filter is dirty, airflow gets restricted. Your system runs, but air can't circulate through your home properly. You might feel a little cool air from the vents, but not enough to cool the space.
Check your filter right now. If it looks dark or clogged, replace it. If you've never replaced it, it's probably clogged. Standard filters are cheap—$10-20—and changing one takes two minutes. Try this first. You'd be surprised how often this solves the problem.
Walk through your home and make sure all your air vents and registers are actually open. Sometimes they get closed by accident or blocked by furniture. If your bedroom vents are closed but your living room vents are open, your bedroom won't cool. Open all your vents and registers, and make sure nothing is blocking them.
Also check your return air intake (usually a large vent where air gets pulled back into the system). If that's blocked or clogged with dust, your system won't have proper airflow.
If you've checked those things and your AC still isn't cooling, something else is happening.
Your AC uses refrigerant to absorb heat and cool your air. If refrigerant levels are low, your system can run all day and won't cool your home effectively. Low refrigerant is usually caused by a leak somewhere in the system. You can't fix this yourself—a technician needs to find the leak, repair it, and recharge the system. This is one of the more expensive repairs, so catching it early matters.
This sounds counterintuitive—frozen parts preventing cooling—but it happens. Your evaporator coil can freeze if refrigerant is too low, if airflow is restricted, or if outdoor temperatures are unusually cold (though this is rare in summer). When the coil freezes, it can't absorb heat, so your system produces no cool air even though it's running.
If you suspect a frozen coil, turn off your AC and let it thaw for a few hours. If the problem was just a one-time fluke, it might start cooling again. But if it happens repeatedly, you need professional help.
Your outdoor AC unit (the condenser) needs clear airflow to do its job. If it's clogged with dirt, leaves, grass, or debris, it can't release heat. Your system will run but produce little to no cool air. Walk outside and look at your condenser. If it's visibly dirty, turn off your system and gently hose it down (don't use a pressure washer—that can damage it). Clear away any debris around it and keep plants at least two feet away.
If the condenser still doesn't work after cleaning, it might have internal issues requiring professional AC service.
Ductwork leaks are sneaky. Your system cools the air, but if your ducts have holes or gaps, that cool air leaks into your attic or walls instead of reaching your home. You end up with a system running full blast and barely any cooling in the rooms where you need it. Ductwork inspection and repair requires professional equipment and expertise.
You've done the filter, checked the thermostat, cleared the vents, and your AC still isn't cooling. At that point, something requires professional diagnosis. It could be low refrigerant, a compressor issue, electrical problems, or something else. A technician has the tools to check your system's performance, measure temperatures, detect leaks, and identify exactly what's wrong.
The longer you wait with a non-cooling AC, the more damage your system can sustain. A small problem caught early is always cheaper than an emergency repair or replacement.
If your AC is running but not cooling, start with the simple checks: thermostat settings, air filter, vents, and outdoor unit. These are free or cheap to fix and often solve the problem. If those don't work, a professional diagnosis is the next step. A technician has the tools to check your system's performance, measure temperatures, detect leaks, and identify exactly what's wrong.
The longer you wait with a non-cooling AC, the more damage your system can sustain. A small problem caught early is always cheaper than an emergency repair or replacement.
Call 919-271-7961 or schedule a service call online to get your AC working again.
Don't spend another summer sweating in a cool house that isn't quite cool enough.
