If your home air conditioner is blowing warm air, it usually means something isn’t working properly in the cooling process. Here are the most common reasons why that might be happening:
It might seem obvious, but double-check your thermostat. Make sure it’s set to “cool” and that the temperature setting is lower than the current room temperature. Also, ensure the fan isn’t set to “on” (which can blow air continuously, even when the AC isn’t cooling).
A clogged air filter restricts airflow, causing the system to overheat or freeze, resulting in warm air. If it’s been more than 1–2 months since your last filter change, swap it out and see if that helps.
Low airflow (due to a dirty filter or duct problem) or low refrigerant levels can cause your evaporator coil to freeze. When this happens, your system can’t properly cool the air. If you see ice buildup on your indoor unit, turn the system off and let it thaw before calling for service.
Your outdoor AC unit (condenser) might have lost power, while the indoor unit (blower) is still running—this means the system is just circulating uncooled air. Check your electrical panel to see if a breaker has tripped.
If your system is low on refrigerant, it can’t absorb heat properly—so the air feels warm. This usually points to a leak somewhere and requires a professional HVAC technician to find and fix it, then recharge the system.
Your outdoor unit needs to release heat, but if it’s covered in dirt, leaves, or debris, it can’t work efficiently. This can cause the AC to struggle or blow warm air. Carefully clean the outside coils or call a pro to handle it.
If your ducts are damaged or leaking, especially in unconditioned spaces like attics or crawl spaces, the cool air may never reach your living areas—leaving you with warm air instead.
The compressor is the heart of your AC system. If it’s damaged or failing, your system might not cool properly. Other parts like capacitors, contactors, or relays can also cause cooling issues if they fail.
Check thermostat settings.
Change the air filter.
Frozen Evaporator Coil.
Tripped breaker in your home circuit.
Make sure compressor and other parts are working properly.
If you’ve checked your thermostat and filter and still can’t get cool air, it’s time to call Fast HVAC. Catching issues early can save you from more expensive repairs—or even a full replacement—later on.
We are authorized dealers and installers of the most common and trusted furnace manufacturers.
If you’ve tried these steps and your AC still won’t give cold air, don’t sweat it—Fast HVAC has you covered. Our trained technicians will quickly diagnose the problem and recommend the right fix, whether it’s a simple repair or a new installation.
If your air conditioner does not cool, the issue could be a thermostat set incorrectly, a dirty air filter, low refrigerant, or a frozen evaporator coil. Start by checking the thermostat and filter before calling an HVAC technician.
When your AC is not turning on, check for a tripped circuit breaker, blown fuse, or thermostat malfunction. If the power supply is fine and the air conditioner won’t turn on, it may be a capacitor, compressor, or control board issue that needs professional repair.
The most common reasons for an AC not cooling include a dirty air filter, low refrigerant levels, a frozen evaporator coil, or blocked condenser unit. Proper maintenance and timely service can prevent these issues.
If your air conditioner is blowing warm air, it may be due to incorrect thermostat settings, a frozen coil, low refrigerant, or power loss to the outdoor unit. Ensure the system is set to “cool” and the filter is clean.
Start with basic AC troubleshooting: check that the thermostat is set correctly, replace the air filter, inspect the outdoor unit for debris, and look for a frozen evaporator coil. If the issue persists, contact a professional.
Yes, a dirty air filter restricts airflow, causing the system to overheat or freeze. This can result in your air conditioner not cooling effectively or blowing warm air.
A frozen evaporator coil is typically caused by poor airflow (often from a dirty filter) or low refrigerant levels. Turn off the system to let it thaw and replace the air filter. If it keeps freezing, call an HVAC technician.
Let’s bring your vision to life with expert craftsmanship and thoughtful design.
16120 Woodinville Redmond Rd NE STE. 15
Woodinville, WA 98072
(206) 558 5112
hello@fastwaterheater.com
Monday – Friday 7:30am-5pm
24/7 Emergency Service Available
HVAC License
NORDSHA772L2
Electrical License
NORDSHA774MR
