Why Your AC Is Blowing Hot Air? Common Causes & What You Can Do
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New Jersey summer heat can be unbearable. The last thing you want is your AC blowing hot air! If your air conditioning isn’t working properly, try these troubleshooting tips and then call the experts at A.J. Perri Plumbing, Heating, and Cooling for quality help.
Why Your AC is Blowing Hot Air: 9 Troubleshooting Tips
Tip #1: Check the Thermostat
To rule out any larger problems, always check your thermostat first if your home isn't cooling down or the A/C is blowing hot air. Make sure it is set to “COOL” and the fan is set to “AUTO.” Perhaps something was reset, or someone changed the schedule to “HEAT” by accident.
A.J. Perri proudly offers the Nest Learning Thermostat, so you won't have to worry about errors when editing schedules. Ask us if Nest is compatible with your system.
Tip #2: Replace a Dirty Air Filter
A clogged or dirty air filter can restrict airflow and make your AC work harder, sometimes causing it to blow warm air. Check your filter regularly and replace it if it looks dusty or clogged. Most filters should be changed every 1–3 months, especially during peak cooling season.
Tip #3: Clean the Outdoor AC Unit
If your system or outdoor unit is dirty, then it may not be working at full capacity and could even cause your AC to blow warm air. You can change the filter and clean the outdoor unit yourself (after turning it off), or you can schedule an A.J. Perri 21-step Precision Tune-up so that one of our expert technicians can get your system up and running as it should!
A.J. Perri always offers the best in-home cooling as a Carrier Factory Authorized Dealer. Our 100% Satisfaction Guarantee means that you can trust your air conditioner to keep your family cool and comfortable.
Tip #4: Check the Circuit Breaker
Your unit may be blowing hot air if it has recently lost power. Take a look at your circuit breaker to see if the AC has tripped it or if there are any blown fuses. Electrical issues are very serious, so be sure to call an expert at A.J. Perri if your HVAC system is losing power.
Tip #5: Look for Refrigerant Leaks
Check for leaks around your AC unit if it continues to blow hot air. Refrigerants are essential to cool the air in the unit before sending it into your home, so low or leaking refrigerant could be the culprit for hot air in your home. Blocked or cracked drain lines aren't good for your unit either, so always schedule an HVAC visit if you see a puddle near your AC unit.
Tip #6: Check for a Frozen Evaporator Coil
If your AC is blowing warm air and you notice ice on the indoor unit or refrigerant lines, the evaporator coil may be frozen. Turn the system off and let it thaw. A dirty filter, blocked airflow, or low refrigerant can cause frozen coils, so call an HVAC technician if the problem returns.
Tip #7: Clean the Outdoor Condenser Coils
Dust, grass clippings, leaves, and other debris around your outdoor unit can prevent heat from being released properly. If the condenser coils are dirty, your AC may run but struggle to cool your home. Keep the area around the unit clear, and schedule maintenance if the coils need a professional cleaning.
Tip #8: Watch for Compressor or Capacitor Problems
The compressor and capacitor are essential to the cooling cycle. If either part fails, your AC may turn on but blow warm air instead of cool air. Because these are electrical and mechanical components, it’s best to have an HVAC technician inspect and repair the issue.
Tip #9: Know When to Call an AC Technician
Sometimes, DIY troubleshooting only goes so far. Here are clear signs that it’s time to call A.J. Perri:
Your AC runs constantly, but still doesn’t cool the house
You notice weak airflow even after changing the filter
The unit cycles on and off more frequently than usual
You hear strange noises like hissing, buzzing, or clanking
There’s a burning smell, gas odor, or tripped breaker you can’t reset
We’re here to diagnose the problem quickly and fix it right—the first time. Call the professionals at A.J. Perri or schedule online. We always guarantee our top-notch repair services on both Carrier systems and all makes and models of air conditioners, including ductless mini-splits. Our industry-certified, trained technicians are available 24/7 (including evenings and weekends) for your convenience.
STAY COOL WITH HELP FROM A.J. PERRI
No one wants to sweat through summer, wondering why their AC is blowing warm air. Whether it’s a simple thermostat fix or a more complex system repair, A.J. Perri is here to help you stay cool and stress-free in New Jersey. No need to worry about the unexpected expense—we offer financing and specials to help ease the blow.
We’ve been keeping homes comfortable for New Jersey homeowners for over 40 years with expert service, honest advice, and satisfaction guaranteed. If your AC is acting up, let our licensed team handle it.
