Arizona summers are no joke—and when your AC starts blowing warm air, panic sets in fast. If you’re asking yourself, “why is my AC running but not cooling?”, you’re not alone. It’s one of the most common complaints we get at Norris Air, especially during peak heat in Mesa, Casa Grande, and surrounding areas.
Let’s break down six possible reasons your system is on but not cooling—and when it’s time to call in the Mesa air conditioning pros at Norris Air.
1. Dirty Air Filters
A clogged air filter restricts airflow, meaning your HVAC system has to work harder just to move air. Eventually, this can cause your evaporator coil to freeze over, leaving your AC on but blowing warm or no air at all.
If you live in a mobile or manufactured home, knowing your mobile home air filter location is especially important—many are hidden or tucked in unusual places.
Tip: Replace your filters every 30–60 days during the summer, or more often during dust storms or monsoons.
2. Low Refrigerant
Refrigerant is what actually cools the air in your system. If your unit is low on refrigerant, it won’t be able to lower your indoor temperature—even if it’s running constantly.
Signs of a refrigerant issue:
- Warm air from vents
- Ice on refrigerant lines
- Hissing or bubbling noises
Only licensed HVAC techs can handle refrigerants safely. If you suspect a leak, call Norris Air for a full system check and recharge.
3. Thermostat Issues
Sometimes the problem isn’t your AC unit at all—it’s the thermostat. A miscalibrated or faulty thermostat may:
- Misread the indoor temperature
- Fail to trigger the cooling cycle
- Get stuck in fan-only mode
Before calling for help, double-check that your thermostat is set to “cool” and your desired temperature is lower than the current room temp.
Still not working? We can inspect and replace faulty thermostats as part of our AC repair Mesa AZ service.
4. Dirty Condenser Coils
The outdoor unit of your AC contains condenser coils that release the heat pulled from inside your home. If these coils are dirty or blocked by debris, your system can’t get rid of the heat—and the result is warm air indoors.
This is especially common in areas with high dust levels like Mesa. Our technicians at Norris Air often clean these coils as part of seasonal maintenance.
5. Ductwork Problems
Leaky or damaged ductwork can let cool air escape before it ever reaches your living spaces. This is a hidden issue many homeowners overlook—but it can cause major efficiency problems and uneven cooling throughout the home.
Signs include:
- Cold air in some rooms but not others
- Higher-than-usual energy bills
- Rattling noises or visible gaps in ductwork
We offer duct inspections and sealing as part of our air conditioning repair services.
6. Aging AC System
Even the best AC systems have a lifespan. If your unit is more than 10–15 years old and struggles to keep up, it may be time for an upgrade. Today’s systems are more energy-efficient and compatible with indoor air quality enhancements for healthier air.
We offer free consultations and honest quotes to help you decide whether it’s time to repair or replace.
Still Not Cooling? Call the Experts at Norris Air
At Norris Air, we know how stressful it is when your AC won’t cool—especially in triple-digit temps. Our licensed techs are available for fast diagnostics and same-day repairs across Mesa, Casa Grande, and surrounding areas.
Whether you need a tune-up, a thermostat fix, or full emergency air conditioning service Mesa AZ residents rely on, we’re here to keep your home cool and comfortable.
Don’t sweat it. Contact Norris Air today and get your AC back to doing what it should—keeping you cool.