Warm air blowing from your AC is the last thing you want on a scorching summer day. With several potential culprits, figuring out why your AC isn’t cooling can be frustrating, but don’t sweat it! We’ve compiled this guide to help you diagnose the problem.
Clogged Air Filter
A dirty air filter can restrict airflow, reducing the system’s ability to cool your space and also affecting indoor air quality.
What you can do:
- Locate your filter and turn off the air conditioner.
- Remove the filter and check for a buildup of dust and dirt.
- Replace the filter if it is dirty. Ensure you use one that’s the correct size and type.
Thermostat Trouble
The issue could be as simple as incorrect thermostat settings or a failure in communication between your thermostat and AC unit.
What you can do:
- Ensure your thermostat is set to “cool” and to a temperature lower than the current room temperature.
- If your thermostat is on “fan” only, it will circulate indoor air but not cool it.
- Change the batteries.
- Call for professional help if the other troubleshooting tips don’t work.
Power Supply
If your AC is not getting any power, it may have tripped the breaker or blown a fuse.
What you can do:
- Ensure that your system is set to “ON”.
- Check your breaker panel to confirm that the breaker has not been tripped or a fuse has not been blown.
- If the breaker has tripped, reset it. If a fuse has blown, replace it.
Clogged Condenser Coil
If dirt, leaves, or debris clog the condenser coil, it won’t expel heat effectively. Which reduces the cool air output and can cause warm air to blow instead.
What you can do:
- Turn off your AC system and find the outdoor condenser unit.
- Check the coil for any debris buildup, taking care not to damage the delicate fins.
- Remove leaves and larger debris carefully by hand.
- For major clogs, schedule a professional cleaning.
Refrigerant Leak
Low refrigerant levels result in less coolant circulating, making it difficult to achieve cold air. This is often due to a leak.
What you can do:
- If you suspect low refrigerant, call a certified technician.
- The technician will diagnose the leak, repair it, and recharge the system.
Wrong AC Unit Size
An incorrectly-sized AC unit can cause a variety of problems, including inadequate cooling.
What you can do:
- Unfortunately, there’s no simple fix for this issue. It requires a professional inspection, and possible replacement of the unit with one that’s the correct size.
Frozen Coil
A clogged evaporator coil, filled with dirt or dust, can become excessively cold, and freeze. This blockage hinders airflow and disrupts the circulation of cool air.
What you can do:
- Turn off the AC system and allow the ice to melt naturally, which may take several hours. Running the fan alone can help circulate air and expedite the thawing process.
- If the freezing issue continues to occur, consult an HVAC technician for a thorough inspection and repair.
Missed Maintenance
If your AC is blowing warm air, it could be due to missed regular maintenance.
What you can do:
- Schedule a maintenance appointment as soon as possible.
- Consider professional seasonal cleaning and tune-ups to ensure your system operates efficiently.
Stay Cool with CK Mechanical
Keep this guide handy for future reference if your AC starts blowing warm air again. Regular maintenance is essential for ensuring optimal performance and keeping you cool throughout the summer. If you haven’t scheduled your summer maintenance yet, there’s no better time than the present!
AC blowing warm air?
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CK Mechanical has provided reliable service and peace of mind for homeowners in Windsor & Essex County since 2009. All our technicians are highly experienced, qualified and trained to critically evaluate all makes and models of HVAC, plumbing and fireplace equipment and to offer the best solution for ensuring your satisfaction.