Why Is My Air Conditioner Blowing Warm Air? | Ultimate Troubleshooting Guide
When your air conditioner starts blowing warm air, it’s more than an inconvenience—it’s a warning sign. In the middle of a Langley or Surrey summer, a malfunctioning air conditioner can quickly make your home uncomfortable and even unsafe.
At Rockson and Sons Plumbing and Heating, our licensed HVAC contractors are often called by homeowners wondering: “Why is my air conditioner not cooling?” This guide walks you through the most likely causes, quick fixes you can try, and when to call for professional air conditioning repair services.
Common Causes of Warm Air from Your AC
Several technical and environmental issues can prevent your air conditioning system from cooling properly. Here are the most common reasons your system might be blowing warm air.
1. Incorrect Thermostat Settings
Your thermostat might be set to “fan” instead of “cool,” or it may have malfunctioned entirely. Also check the temperature settings and ensure the unit is receiving power.
2. Clogged Air Filters
A dirty air filter limits airflow, which can cause your AC system to overheat. When this happens, the cooling process stops while the fan continues running, pushing warm air throughout your home.
Note: Change your filters every 60 to 90 days to prevent this issue.
3. Low Refrigerant or a Leak
If your air conditioner is low on refrigerant or has a leak, it will struggle to remove heat from your home. You might notice your AC takes longer to cool or never really gets cold at all.
This is a job for a professional—adding refrigerant without fixing the underlying leak is not safe or effective.
4. Electrical Problems
Sometimes, the indoor AC unit is working, but the outdoor unit has lost power due to a tripped circuit breaker. This results in airflow without cooling.
Try resetting your breakers. If the problem persists, call a licensed HVAC technician.
5. Frozen Evaporator Coils
Frozen coils prevent your air conditioner from cooling your home. This can be caused by low refrigerant, airflow issues, or running the system continuously. When coils freeze, you’ll feel warm air from the vents, even though the system seems to be on.
How Climate Impacts AC Performance?
Langley and Surrey experience warm, humid summers that can push older AC systems to their limits. Moisture and pollen buildup, along with fluctuating outdoor temperatures, make preventative maintenance critical in this region.
Read Also: Heat Pump vs Air Conditioner - Which is better for Cooling?
Quick Fixes to Try Before Calling a Technician
If your air conditioner is blowing warm air, you can try a few simple solutions:
- Double-check the thermostat mode and temperature
- Replace your air filter if it’s dirty
- Inspect the outdoor unit for debris or obstructions
- Reset the circuit breaker
If the issue persists, it’s time to bring in a professional HVAC contractor.
When to Call a Licensed HVAC Contractor?
Some AC problems go beyond quick fixes. Contact Rockson and Sons Plumbing and Heating if you experience:
- Water or refrigerant leaks
- Unusual noises such as buzzing, banging, or hissing
- Weak airflow or no cooling despite normal operation
- A system that cycles on and off frequently
Delaying professional air conditioning repair service can lead to bigger problems or even system failure.
How to Prevent AC Problems in the Future?
Routine maintenance is the best way to extend the life of your system and avoid emergency calls. Here are a few best practices:
- Schedule a professional AC repair service each spring
- Change your filters every 3 months
- Keep the outdoor unit free of leaves and dirt
- Monitor your utility bills for sudden increases
Regular maintenance from certified HVAC contractors ensures your system runs efficiently throughout the cooling season.
Read Also: Importance of Regular HVAC Maintenance Service
Average Cost of Air Conditioning Repairs in Langley and Surrey
Actual costs vary based on system type, parts availability, and repair complexity.
Why Choose Rockson and Sons Plumbing and Heating?
At Rockson and Sons, we’ve built a reputation as one of the most trusted HVAC contractors in Langley and Surrey. Our team of licensed professionals provides honest assessments, prompt repairs, and long-lasting solutions.
We specialize in:
- Air conditioning repair services
- Plumbing system diagnostics and tune-ups
- Energy-efficient system upgrades
- Emergency HVAC repairs
We take pride in offering transparent pricing, exceptional workmanship, and fast response times.
Book Your Free AC Assessment Today
If your air conditioner is blowing warm air, don’t wait for the problem to get worse.
Call Rockson and Sons Plumbing and Heating at 604-802-9527 to speak directly with a licensed HVAC technician for air conditioning repair service. Or fill out our online request form and we’ll contact you within one business day to schedule your free AC assessment.
We serve residential and commercial properties throughout Langley, Surrey, Cloverdale, and surrounding areas.
Frequently Asked Questions
1. Can a clogged filter really cause my AC to blow warm air?
Yes. Dirty filters restrict airflow and can shut down the cooling function.
2. Should I try to add refrigerant myself?
No. Only certified HVAC contractors can handle refrigerant safely and legally.
3. How long does a typical AC repair take?
Most standard repairs are completed within 1–2 hours. However, it depends on the issue.
4. What if my system is old—should I repair or replace?
If your system is 12–15 years old and frequently breaks down, replacement may be more cost-effective long-term.
Conclusion: Don’t Let Warm Air Worsen Your AC Issues
A warm air problem may seem minor, but left unchecked, it can lead to more serious—and expensive—repairs.
Trust Rockson and Sons Plumbing and Heating for reliable air conditioning repair services in Langley, Surrey, and beyond. Whether it’s a simple fix or a complete system evaluation, we’re here to keep your home cool and comfortable.
Call 604-802-9527 or fill out our online form today to book your free consultation with our expert HVAC contractors.