AC Not Cooling? 6 Things to Check Before Calling for Repair
There’s no denying that a properly working air conditioner makes all the difference during a hot Chicagoland summer. But when an AC runs constantly without actually cooling the house, many homeowners assume a full repair is the only option. In some cases, the cause is something simple enough to check before calling for service.
Working through a few quick checks can save the cost of a service call entirely, or at least narrow down what’s actually going wrong. Here are six common reasons an air conditioner stops cooling effectively, along with what to check before scheduling repair.
How to Check Your AC Before Scheduling Repair
Most cooling problems trace back to a handful of common causes, and several of them take only a few minutes to check. Working through the list below can save you the cost of an unnecessary service call. If the problem continues after trying each one, it’s a sign the issue needs a trained technician.
1. Check Your Thermostat Settings
This is one of the most overlooked steps in AC troubleshooting, and it only takes a few seconds to check, so it’s worth ruling out first. Make sure the thermostat is set to “cool” rather than “heat” or “fan,” with the target temperature set lower than the current room temperature, and swap out the batteries if it runs on them, since dead batteries are responsible for more cooling complaints than most homeowners realize.
2. Inspect Your Air Filter
A clogged air filter restricts the air moving across the coil inside your unit, and once airflow drops low enough, many units can’t cool effectively, no matter how long they run. Here is what to look for when you pull the filter:
- Heavy gray or brown buildup covering most of the surface
- Visible debris like pet hair, dust clumps, or insulation fibers
- Collapsed or bent filter material restricting airflow even further
If your filter looks like any of the above, replace it before running the unit again. Staying on top of filter changes is one of the simplest forms of AC maintenance you can do, and it protects both your unit and your home’s comfort throughout the season.
3. Look for a Tripped Breaker or Blown Fuse
Check your electrical panel for any breakers in the tripped position, since air conditioners draw significant power at startup, and a tripped breaker is one of the most common reasons a unit stops cooling mid-cycle. Resetting it and running the unit again will tell you right away whether that solved the problem.
If the breaker trips a second time, that usually means the issue goes beyond a simple overload and points to an electrical fault that needs a professional to diagnose safely. Continuing to reset it at that point can do more harm than good, so it’s best to leave that repair to a trained technician.
4. Check the Outdoor Condenser Unit
Walk outside and take a look at your condenser before assuming the worst, since a few common issues can keep it from releasing heat properly:
- Debris blocking the unit: Leaves, grass clippings, or overgrown shrubs packed against the unit can restrict the airflow it needs to release heat
- Bent or dirty fins: Damaged fins on the coil reduce how efficiently the unit can dissipate heat from inside the home
- Fan not spinning: If the outdoor fan isn’t turning while the unit runs, heat has nowhere to go
Clearing debris and straightening fins will often restore normal airflow right away, but if the fan still isn’t spinning after the area is clear, that usually indicates a motor issue that requires a technician to repair.
5. Watch for Ice on the Evaporator Coil
Ice on the indoor coil means airflow across it has dropped too low for the coil to stay above freezing, which can happen because of a dirty air filter, closed vents throughout the home, or low refrigerant. Once ice forms, it blocks even more airflow, which makes the problem worse the longer the unit keeps running.
Turning the unit off and switching to fan-only mode lets the ice melt completely, which matters since running it while frozen can damage the compressor. Give it time before turning the cooling back on so you’re not risking further damage to the unit.
6. Listen for Refrigerant Leak Warning Signs
Refrigerant absorbs heat from inside your home and releases it outside, so when a leak drops the refrigerant level too low, your unit loses much of its cooling capacity. That is why warm air from the vents, despite constant operation, is one of the clearest signs that something is wrong.
Hissing or bubbling sounds near the refrigerant lines often indicate the exact location of the leak, but this isn’t a repair you can handle yourself. Working with refrigerant requires EPA certification under federal law, so it’s worth calling a professional as soon as you notice these signs.
When These Checks Don’t Solve the Problem
If you’ve worked through all six checks and your air conditioner still isn’t cooling, the problem goes beyond basic troubleshooting. Issues like a failing compressor, a refrigerant leak beyond a simple recharge, or an electrical fault inside the unit require a licensed technician to diagnose and repair safely.
A-All Temp Heating & Cooling has helped homeowners throughout Naperville and the surrounding Chicagoland area diagnose stubborn cooling problems like these for decades. Our technicians arrive with the tools to find what these checks can’t, often restoring cooling the same day they’re called.
Schedule AC Repair in Naperville, IL
A cooling problem rarely waits for a convenient time, especially once Chicago’s summer heat settles in for good, so if you’ve gone through the checks above and your air conditioner still isn’t keeping up, it’s time to bring in a professional.
A-All Temp Heating & Cooling proudly serves Naperville, Aurora, Bolingbrook, and the surrounding Chicagoland area, and our technicians are ready to diagnose the problem and get your home cooling again. Call us at (630) 355-4474 or request service online to schedule your appointment today.
