When your AC unit is blowing warm air instead of cool, it can be frustrating—especially during Calgary’s hot summer months. If your air conditioning system isn’t performing as expected, don’t panic! There are several common reasons why your system might not be cooling properly, and in many cases, the fix is simple.
Let’s go over the most common causes and how to get your AC system running efficiently again.
1. Thermostat Issues
The first thing to check when your air conditioning system is blowing warm air is the thermostat. It may sound simple, but incorrect settings or a malfunctioning thermostat can cause cooling problems.
Quick Fix:
- Make sure the thermostat is set to “Cool” and not “Fan” or “Heat.”
- Check that the temperature setting is lower than the current room temperature.
- If your thermostat runs on batteries, replace them and see if that helps.
- Consider upgrading to a programmable or smart thermostat for better efficiency.
2. Dirty or Clogged Air Filter
A clogged air filter restricts airflow, which can cause your air handler to overwork and reduce cooling efficiency. This can lead to warm air coming from your vents.
Quick Fix:
- Check your air filter and replace it if it’s dirty (every 1-3 months is recommended).
- If you have pets or allergies, consider using a high-efficiency filter for better indoor air quality.
3. Low Refrigerant Levels or Leaks
Refrigerant is what cools the air in your cooling system. If your AC is blowing warm air, it might be due to a refrigerant leak or low levels
Signs of Low Refrigerant:
- Warm air from vents
- Ice buildup on the outdoor unit or refrigerant lines
- Hissing or bubbling sounds (a sign of a leak)
What to Do:
Refrigerant issues require professional repair. Calgary-based HVAC technicians can inspect for leaks, recharge refrigerant, and ensure your system is running efficiently.
4. Frozen Evaporator Coil
If your AC unit is running but not cooling, a frozen evaporator coil could be the culprit. This happens when airflow is restricted or refrigerant levels are low.
Quick Fix:
- Turn off the AC and let the ice thaw (this may take several hours).
- Check and replace your air filter.
- Schedule an inspection to check refrigerant levels and airflow issues.
5. Dirty or Blocked Condenser Unit
The outdoor unit (condenser) needs proper airflow to release heat. If it’s covered in dirt, debris, or leaves, it won’t cool efficiently.
Quick Fix:
- Turn off the system and clear any debris around the unit.
- Hose down the condenser coil to remove dirt buildup.
- Keep plants and objects at least two feet away for proper airflow.
6. Electrical or Wiring Issues
Faulty wiring, a tripped breaker, or electrical malfunctions can stop your AC from cooling properly.
Quick Fix:
- Check your electrical panel to see if a breaker has tripped.
- Reset the breaker if necessary, but if it keeps tripping, call a professional.
7. Ductwork Leaks or Blockages
If there are leaks in your ductwork, cool air may be escaping before reaching your rooms, leading to warm air blowing from vents.
Quick Fix:
- Inspect exposed ductwork for visible leaks or damage.
- Have a professional perform a ductwork inspection and sealing if neede
8. Air Conditioner Installation Issues
An improperly installed air conditioning system can cause ongoing performance issues. If your unit was not sized correctly for your home’s square footage, or if there were errors in installation, it may struggle to cool your home.
What to Do:
- If your AC has never worked correctly since installation, call a Calgary-based HVAC expert to assess if the system was installed properly.
- A professional air conditioner installation service can ensure your unit is the right size and set up correctly.
9. Compressor Problems
The compressor is the heart of your AC system. If it fails, your AC won’t be able to cool air properly.
Signs of Compressor Issues:
- Loud noises from the outdoor unit
- AC runs but doesn’t cool
- Frequent system shutdowns
What to Do:
A failing compressor often requires professional repair or replacement. If your system is over 15 years old, it may be time for a new air conditioner installation.
Frequently Asked Questions
How can I prevent my AC from blowing warm air?
Regular maintenance is key. Change air filters regularly, keep the outdoor unit clean, and schedule annual HVAC inspections.
How much does it cost to fix an AC that blows warm air?
Regular maintenance is key. Change air filters regularly, keep the outdoor unit clean, and schedule annual HVAC inspections.
When should I replace my AC instead of repairing it?
If your system is over 15 years old and requires frequent repairs, investing in a new air conditioner installation may be more cost-effective.
Can an undersized AC cause warm air issues?
Yes! If your AC unit is too small for your home’s square footage, it will struggle to cool effectively. A professional Calgary-based HVAC expert can assess whether you need a larger unit.
Need Professional AC Repair or Installation in Calgary?
If your air conditioning system is blowing warm air, don’t suffer in the heat. AAA Heating and Plumbing provides expert air conditioner installation, repair, and maintenance services throughout Calgary. Our team of highly trained HVAC professionals can quickly diagnose and resolve cooling issues, ensuring your home stays comfortable all season long.
Whether you need a simple repair, a refrigerant recharge, or a brand-new AC installation, we have the expertise to handle it all. We work with high-efficiency systems to help you lower your energy consumption while keeping your home cool.
With years of experience serving Calgary homeowners, we are committed to quality service, fast response times, and transparent pricing. Don’t let an inefficient AC unit ruin your summer—get in touch with us today for a professional consultation and expert service you can trust!
